7(n+4)=21 what is n?

Answer:

Car Z has better petrol consumption. Choice C. Z

Step-by-step explanation:

Petrol Consumption

Car Y travels 105 miles on 3 gallons of petrol. The average consumption is 105 / 3 = 35 miles/gallon

Car Z travels 80 miles on 9 litres of petrol. Since 1 gallon=4.5 litres, the consumption of car Z is 9/4.5= 2 gallons. The average consumption is 80/2 = 40 miles/gallon.

This means that car Z has better petrol consumption. Choice C. Z

Answer:

The answer is  C [ the third choice]

Step-by-step explanation:

Answer: I'm not sure what the answer is so I'd either choose :

C.) n > 6/7 or

D.) n > - 6/7

Answer:

corresponding

Step-by-step explanation:

they are Supplementary . Because the total angle of angle 1 and 2 when added they should give 180°.

more information pls

Answer:

-40

Step-by-step explanation:

Answer:

-40

-2 x 5=-10

You have the 4 and you need to multiply it by -10

-10 x 4 =-40

Answer:

18

Step-by-step explanation:

75 divided by 4 is 18.75

so there are 18 servings

Answer:

Step-by-step explanation:

2,23

4,24

6,25, etc

Answer:

It will be 5 seconds before the ball hits the ground  

Step-by-step explanation:

∵ A ball is thrown from the top row of seats in a stadium

∵ The function

∵ h(t) = −16t² + 64t + 80 , gives the height, in feet, of the ball t seconds

   after it is thrown

∵ The ball hits the ground

→ That means h(t) = 0

∵ h(t) = 0

∴ 0 = -16t² + 64t + 80

→ Reverse the two sides

∴ -16t² + 64t + 80 = 0

→ Divide both sides by -16 to simplify it

∵  [tex]\frac{-16t^{2}}{-16}+\frac{64t}{-16}+\frac{80}{-16}=\frac{0}{-16}[/tex]

∴ t² - 4t - 5 = 0

→ Factorize it into two factors

∵ t² = t × t

∵ -5 = -5 ×  1

∵ -5t + 1t = -4t ⇒ the middle term

→ The factors are (t - 5) and (t + 1)

∴ (t - 5)(t + 1) = 0

→ Equate each factor by 0 to find t

∵ t - 5 = 0

→ Add 5 to both sides

∴ t = 5

∵ t + 1 = 0

→ Subtract 1 from both sides

∴ t = -1 ⇒ rejected because no negative value for the time

∵ t = 5

∴ It will be 5 seconds before the ball hits the ground  

Answer:

Your answer is:

1) 6 ( 5 + 8 ) = 78

2) 5 ( 10 + 3 ) = 65

3) 9 ( 2 + 4 ) = 54

4) 7 ( 3 + 6 ) = 63

Step-by-step explanation:

Hope this helped : )

Answer:

A B and D

Step-by-step explanation:

the number just has to be below 1/1

Answer:

0.156

Step-by-step explanation:

step1. add 40 + 38 = 78

step2. divide 78 by 500 to get 0.156

hope im right

Answer:

20!

Step-by-step explanation:

Isosceles triangles have 2 angles are the same. Since we can't do 140, because interior angles of a triangle equal 180, then we need to subtract 140 from 180. 180-140=40. 40/2 because of 2 angles=20. 20 is the angle.

Answer:

20

Step-by-step explanation:

Answer:

y= - 4/6x+1.66

Step-by-step explanation:

To get the slope you subtract y2-y1 / x2-x1. This gives the slope. Then you need to get the y-intercept. This can be done by substituting the slope and the coordinates of a point (x, y) on the line in the slope-intercept formula and then solve for b.

Answer:

divide both number by the same amount

Answer:

y = 90

Step-by-step explanation:

Since, e || f and a || b

Therefore, quadrilateral so formed is a rectangle.

Each angle of a rectangle is right angle.

[tex] \therefore \: y \degree = 90 \degree \\ \\ \huge \red{ \boxed{ \therefore \: y = 90}} \\ \\ [/tex]

x^4+6x^3+35x^2+18x+9

All I can figure out sorry

Answer:

The correct option is, Exponential Decay, $23,914.85.

Step-by-step explanation:

A farmer buys a tractor for $50,000.

It is provided that the the tractor depreciates 10% per year.

The exponential function for decay is:

[tex]y=a\cdot (1-r\%)^{t}[/tex]

Here,

a = initial value

r = decay rate

t = time

Compute the value of the tractor in 7 years as follows:

[tex]y=a\cdot (1-r\%)^{t}[/tex]

  [tex]=50000\times (1-0.10)^{7}\\\\=50000\times 0.4782969\\\\=23914.845\\\\\approx 23914.85[/tex]

Thus, the correct option is, Exponential Decay, $23,914.85.

Answer:

Step-by-step explanation:

let number be x

CASE 1) when x>13

2(x-13) = 4

2x - 26 = 4

2x = 30

x = 15

CASE 2) when x<13

2(13 - x) = 4

26 - 2x  = 4

26 - 4 = 2x

22 = 2x

11 = x

Answer:

1/25

Step-by-step explanation:

I worked out the equation!

Answer:

8.0 g

Step-by-step explanation:

you have a ratio of 1.6g : 1 cm^3.

x : 5.0?

1.6 * 5.0 = 8

If this is chemistry, you have 2 sig figs. Therefore your answer is 8.0 g

Answer:

Step-by-step explanation:

400 + 0.03x > 700

Answer:

the answer would be 6.50

Step-by-step explanation:

unit price is the price for 1 pound in this example, to find it you have to divide 29.25 by 4.5 which would give you 6.50, hope this helps!

Answer:

(5,40)

Step-by-step explanation:

Answer:

Step-by-step explanation:

-1,8

Step-by-step explanation:

Hey there!

Given; The points are; (19,14) and (21,19).

Note: Use slope formula.

[tex]slope(m) = \frac{y2 - y1}{x2 - x1} [/tex]

Put all values.

[tex]m = \frac{19 - 14}{21 - 19} [/tex]

Simplify it.

[tex]m = \frac{5}{2} [/tex]

Therefore, slope(m)= 5/2.

Hope it helps...

Answer:

slope = 5/2

Step-by-step explanation:

[tex]m=\frac{y_{2}-y_{1}  }{x_{2}-x_{1}  }[/tex]

[tex]\frac{19-(14)}{21-(19)}[/tex]

m=[tex]\frac{5}{2}[/tex]

Answer:

2/15

Step-by-step explanation:

2/3*1/5=2/15

Answer:

0.133

Step-by-step explanation: