Mathematics High School

7x+3y=11
3x-y=23
Solve by substitution

Answers

Answer 1
hope this helps have a nice day :)
7x+3y=113x-y=23Solve By Substitution

Related Questions

How many grams are 7.00 x 1022 molecules of NaOH?

Answers

Answer:

46.5

explanation

6.022*10^23 molecules=40g.

7.00*10^23=40*7.00*10^23/6.022*10^23 g =46.5 g

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 4.65g  are  7.00 x 10²²  molecules of NaOH.

What is mole?

The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample.

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

given number of atoms of NaOH= 7.00 x 10²² atoms

Substituting the values

mole=7.00 x 10²²÷ 6.022×10²³

mole =0.116 moles of NaOH

mass of NaOH= Molar mass of NaOH× moles of NaOH

= 40 × 0.116

= 4.65g

Therefore, 4.65g are  7.00 x 10²²  molecules of NaOH.

To know more about mole, here:

brainly.com/question/15209553

#SPJ2

Help please due in 45 minutes

Answers

Answer: B

Step-by-step explanation:

The expression (n^14)(n^3) is equivalent to n^x
What is the value of x

Answers

Answer:

17

Step-by-step explanation:

add the exponents

Your answer is 17 have a good day

What is the value of t?plz help

Answers

Answer: 3t12=15t this is what my tech told me

Step-by-step explanation:

Answer:

18

Step-by-step explanation:

these are vertical angles so they equal each other

3t + 12 = 66

3t = 66 - 12

3t = 54

t = 54 ÷ 3

t = 18

When you exercise, your target heart rate r at 70% can be determined by the formula r = 0.7(220 − a) where a represents your age in years. Solve the formula for a.


PLEASE HELP

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don’t use those links they’re scams

someone help me quickly

Answers

the answer is 36 because you multiply the width times height times length

What is the complete factorization of
8y3 – 4y2 + 10y?

Answers

2y(4y^2-2y+5) hope this helps

i need help with this please

Answers

Answer:

diameter = 24 yards

Step-by-step explanation:

C = π·d

75.36 = 3.14d

d = 75.36/3.14

d = 24

Naman purchases 3 vases for an upcoming event for m dollars each. Each vase is charged an addition 5% sales tax. Which expressions can Naman use to express the total cost of the 3 vases? Select each correct answer. 3.05m 3(m+0.05m) 3.15m 3m + 0.05m

Answers

The two that have 0.05 in it

LAST POINTS PLEASEE PLEASEEEE HELP!! :(

Answers

Answer:

D. 22  2/3

Step-by-step explanation:

To find area you multiply length times width.

Here:

L = 5 2/3

and W = 4

So multiply 5 2/3 by 4, you get 22 2/3

Good luck! Please mark brainliest!

pls help ty identify the translation

Answers

B translated 2 units down

Someone help plz make sure it’s right?

Answers

Sohcahtoa
Use toa, tangent = opposite/adj
Opposite = 20
Adjacent = 21
TanX = 20/21

The solution is C

The parallelogram shown below has an area of 35 units^2 2 squared. Find the missing height. h =h=h, equals units

Answers

Answer:

h = 5 units

Step-by-step explanation:

Given that,

The area of the parallelogram, A = 35 unit²

In the attached figure, we can see that the base is 7 unit.

We know that,

Area of a parallelogram, A = b × h

So,

[tex]h=\dfrac{A}{b}\\\\h=\dfrac{35}{7}\\\\h=5\ units[/tex]

So, the value of h is equal to 5 units.

Please help with scale factor!!!!!!!! I will mark brainliest if right! Two rectangular prisms have a side scale factor of 1/4. If the smaller prism has a surface area of 45cm square, what is the surface area of the larger prism? Find the scale factor and area.

Answers

Answer:

1/16720 cm²

Step-by-step explanation:

Area is the product of two dimensions.

If the scale factor is 1/4, the ratio of the areas will be:

(1/4)² = 1/16

The smaller prism has a surface are of 45 cm².

The larger prism has a surface area:

45*16 = 720 cm²

5 divided by 14?



......................................

Answers

.3571428571z................

Answer:

0.3571

Step-by-step explanation:

Step 1: Start by setting it up with the divisor 14 on the left side and the dividend 5 on the right side like this:

14[tex]\sqrt{x}[/tex]5

Step 2: The divisor (14) goes into the first digit of the dividend (5), 0 times(s).

Therefore, put 0 on top:

14[tex]\sqrt{x}[/tex]0 5

Step 3: Multiply the divisor by the result in the previous step (14 x 0 =0) and write that answer below the dividend.

14 0

  [tex]\sqrt{x}[/tex]5

   0

Step 4: Subtract the result in the previous step from the first digit of the dividend (5-0 = 5) and write the answer below.

14 0

[tex]\sqrt{x}[/tex] 5

-0/5

Please Help ASAP
A car travels 220 miles in 4 hours. If the car travels at the same speed, how far will it have traveled after 6 hours?

Answers

Answer: 330

Step-by-step explanation:

220 divided by 4 is 55 meaning 55x4=220 so in that case 55x6=330

Please help with this math problem!

Answers

y=6x^2 -5x+6 ( the first option )

Please help! you will get 'Brainliest' if you do.

Answers

Answer:

D is correct, based on my understanding

Step-by-step explanation:

A town government is designing a new bus system. The planners are deciding where to put the different bus stops. They want to pick a set of bus stop locations that will minimize the distance anyone needs to walk in order to get to any bus stop in town. What term best defines this kind of problem

Answers

Answer:

Optimisation Problem

Explanation:

Optimisation Problem is a mathematical economics, computer science problem - which finds the best solution from all feasible solutions (based on constraints & other aspects).

The problem might be in form of maximisation or minimisation. The bus system designing is based on minimizing walking distance. Thus is an optimisation problem.

A swim instructor would like to test the effect of a new swim technique versus the standard technique for a group of 25 competitive swimmers.

The swim instructor divides the students by class (junior or senior), and then randomly allocates half of the 14 juniors and 5 of the 11 seniors to receive instruction on the new technique.

During swim practice, the instructor times the juniors as they race against each other to see if those who learned the new technique outperform their peers. The instructor does the same for the seniors.

At the end of practice, the instructor compares the average swim time for both juniors and seniors among those who did and did not use the new technique.

A) The instructor should place the 25 student names on slips of paper and place them in a hat. Twelve of the slips should be drawn out and those students should receive the instruction on the new technique.

B) The instructor should place the names of the 14 juniors on slips of paper and place them in one hat. The 11 seniors’ names should be placed on slips of paper and placed into a separate hat. The instructor should randomly select 7 juniors and 5 seniors to receive instruction on the new technique.

C) For each student, the instructor should flip a coin. If the coin lands on heads, the student will receive instruction on the new technique. If the coin lands on tails, the student will not receive instruction on the new technique.

D) The students should line up alphabetically and count off by 2s. Every student who gets a 1 will receive instruction on the new technique. Every student who gets a 2 will not receive instruction on the new technique.

Answers

Answer:

B on Edge 2021.

Step-by-step explanation:

BBBBBB

Answer:randomized block experimental design

Step-by-step explanation:

CORRECT ON EDGE 2022

pls help with these math problems

Answers

Answer:

Step-by-step explanation:

1)

First we add what we know for y into the second equation.

5x - 4(x +2)= -3

From there, we simplify it

5x-4x-8= -3

x-8=-3

Now we get the x on its own

x=5

and now we add x=5 into the first equation that we had and simplify to find y

y=5+2

y=7

So the answer is x=5, y=7 or (5,7)

2)

For this one we do the same thing as with 1.

Add what we know for y (bottom equation) to the top equation

3x-8(x-8)=24

Now we simplify

3x-8x+64=24

-5x+64=24

And now solve for X

-5x=-40

x=8

And then substitute x=8 to find y

y=8=8

y=0

So the answer is x=8, y=0 or (8,0)

In illustrating combination question, during conference meeting there are 7 guests bumped their elbow instead of shake hand in greeting each of other to observe the health protocol ,and show the solution please...

Answers

dic Head bc you are slow and you asking Brainly for the answer

!!!!!!!!!!!!!!!!!!!!!!

Answers

It think that it would be b would be b

Manuel has $50 in his bank account. Starting this week, he will deposit $30 into the
account each week. If Manuel does not take any money out of his account, how many
weeks will it take for the total amount of money in his account to reach $320?

Answers

Answer:

9 weeks

Step-by-step explanation:

50+ (30x9)=320

8 weeks because $50+$30 is $80. $80-$320 is $240.split $240 into 8 separate payments of $30

222222+666666689879=?

Answers

Answer:

666666912101

Step-by-step explanation:

Add it

Answer:

6.666669121  x 10 to the 11th power

Step-by-step explanation:

Between which two points is 95 located on the number line below?

Answers

Answer: A

Step-by-step explanation: The square root of 9 is 9.7 so it would be between 5 and 10

Answer:

A. W and X

Step-by-step explanation:

√95

9.74679434481

This number is close to 10.

5 and 15 are on the sides of 10.

X(10) is between W(5) and Y(15).

PLEASE I NEED HELP IM SO CONFUSED, ILL GIVE BRAINLIEST AND 5 STARS AND HEART IF CORRECT

Answers

Answer:

im pretty sure the ones that say "if not replaced" are independant, sorry if im wrong but im trying to help you out :)

Step-by-step explanation:

is
5x^2y^3z^5
a polynomial
explain

Answers

Answer:

no

Step-by-step explanation:

A polynomial is a combination of terms separated by  +  or  −  signs. A polynomial does not contain variables raised to negative or fractional exponents, variables in the denominator or under a radical, or any special features such as trigonometric functions, or logarithms.

no it is not a polynomial

A store sells watches for $69.99 each and watch batteries for $9.50 each. Justin is buying 2 watches and x number of watch batteries. Which equation can be used to find y, the total price Justin must pay in dollars?

A y = 139.98x + 9.50x

B y = 69.99x + 9.50

C y = 9.50x + 69.99

D y = 9.50x + 139.98​

Answers

Answer:

D. y= 9.50x + 139.98

Step-by-step explanation:

69.99 x 2 = 139,98

Martha bought a 0.35​-kilogram bottle of spice. She uses 70 grams a week. Is one bottle of spice enough for 6 ​weeks? Explain.

Answers

Answer: No

Step-by-step explanation:

She needs more than the bottle provides

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