Help me with thisss please its timed!!! i need help

Answer:

D

Step-by-step explanation:

Using the rule of exponents

[tex]\frac{a^{n} }{a^{m} }[/tex] = [tex]\frac{1}{a^{(m-n)} }[/tex]

Given

[tex]\frac{25a^{-5}b^{-8} }{5a^{4}b }[/tex]

= [tex]\frac{25}{5}[/tex] × [tex]\frac{a^{-5} }{a^{4} }[/tex] × [tex]\frac{b^{-8} }{b^{1} }[/tex]

= 5 × [tex]\frac{1}{a^{(4-(-5))} }[/tex] × [tex]\frac{1}{b^{(1-(-8))} }[/tex]

= 5 × [tex]\frac{1}{a^{9} }[/tex] × [tex]\frac{1}{b^{9} }[/tex]

= [tex]\frac{5}{a^{9}b^{9} }[/tex] → D

Answer:

Step-by-step explanation:

radius of the circle=12 cm / 2=6 cm

Area of the square=side²=(12 cm)²=144 cm²

Area of the circle=πr²=(3.142)(6 cm)²≈(3.142)*36 cm²≈113.112 cm²

Area of the four  sides between the square and the circle=

=Area of the square - area of the circle=144 cm²-113.112 cm²=30.888 cm²

shaded area =30.888 cm²/4=7.722 cm²

Answer =7.722 cm²

Step-by-step explanation:

Find the cost of one part and then multiply that number by 9

Answer:

90 micrometers / 1,000,000 = 0.00009  meters =

9 x 10^-5 meters

Step-by-step explanation:

Answer:

0.9 x 10^-4

Step-by-step explanation:

its pretty simple lol

Answer:

CD = 3.9 (if you round up then it would be 4)

Step-by-step explanation:

6.5 - 2.6 = 3.9

Answer:

132

Step-by-step explanation:

13x2= 26 26+18 = 44

44x3=132

Answer:

15%

Step-by-step explanation:

[tex]\frac{76.50}{90}=\frac{x}{100}[/tex]         Set up a proportion.

[tex]90x=7,650[/tex]      Cross-multiply.

[tex]x=85[/tex]               Divide both sides by 90.

[tex]100-85=15[/tex]    The discounted price is 85% of the regular price so the                                          

                        discount is 15%.

Answer:

-1 3/4

Step-by-step explanation:

1/2x + 1/2x + x

2x = -3 1/2

/2       /2

x   =   -1 3/4

Answer:

£3.50

Step-by-step explanation:

£4.90 = 7/8

£4.90/(7/8) = £5.60 (Total Amount of Money)

£5.60 x (5/8) = £3.50

Answer:

£3.50

Step-by-step explanation:

    [tex]\frac{7}{8}[/tex] = £4.90

(÷7)              (÷7)

    [tex]\frac{1}{8}[/tex] = £0.70

(×5)              (×5)

    [tex]\frac{5}{8}[/tex] = £3.50

I hope this helps <3

Answer:

b) AD || BC

Step-by-step explanation:

The missing options are:

a) AB || DC

b) AD || BC

c) none

The missing drawn is shown in the figure attached.

The only way that m∠8 = m∠4 is that segment AD and segment BC are parallel. Because in that case, they are alternate angles, and therefore, they are equal. Notice that angle 8 lies on side AD and angle 4 lies on BC

Answer:

b) AD || BC

Step-by-step explanation:

Answer:

Is D

Step-by-step explanation:

Because is moving four times right and four times down.

Answer:

14

Step-by-step explanation:

(1*1)+(2*2)+(3*3)

1+4+9

5+9

14

Answer:  

4/7

Step-by-step explanation:  Since there are 7 possible outcomes because there are 7 triangles the denominator will be 7. Since there are 4 white squares the chances of landing on one is 4/7

Answer:

sqrt(6x^2+18x)

Step-by-step explanation:

sqrt(6x) * sqrt(x+3)

We know sqrt(a)sqrt(b) = sqrt(ab)

sqrt(6x * (x+3))

sqrt(6x^2+18x)

Answer:

[tex]\text{B. } \sqrt{6x^2+18x}[/tex]

Step-by-step explanation:

[tex]\sqrt{6x}\sqrt{x+3}[/tex]

[tex]\sqrt{6x(x+3)}[/tex]

[tex]\sqrt{6x^2+18x}[/tex]

Answer:

8.49

Step-by-step explanation:

8 + .49 = 8.49     :)

Answer: C or 2 seconds.

Step-by-step explanation:

To find the vertex in a standard form equation: (-b/2a,f(-b/2a))

plug it in: -64/2*-32 = 2

Answer:

[0, infinity)

Step-by-step explanation:

The domain is including all numbers from 0 to infinity.

The reason negative numbers are not included is because of the [tex]\sqrt{x}[/tex]. A negative number cannot be included there, otherwise it would be what's called an "imaginary number" (i).

Therefore, every number besides negative numbers are included in the domain.

Answer:

Step-by-step explanation:

[tex]y = 7x + 1.\\(6,-5)\\m= 7\\x1= 6\\y1 = -5\\y-y1=m(x-x1)\\y-(-5) = 7(x-6)\\y+5=7x-42\\y=7x-42-5\\y = 7x-47[/tex]

Answer:

The area of trapezoid is 39.6cm²

Step-by-step explanation:

Given that the formula of area of trapezoid is A = 1/2×(a+b)×h where a and b is the length and h is the height. So you have to substitute the values into the formula :

[tex]area = \frac{1}{2} \times (a + b) \times h[/tex]

[tex]let \: a \: = 8.9 \\ let \: b \: = 5.5 \\ let \: h \: = 5.5[/tex]

[tex]area = \frac{1}{2} \times (8.9 + 5.5) \times 5.5[/tex]

[tex]area = \frac{1}{2} \times 14.4 \times 5.5[/tex]

[tex]area = \frac{1}{2} \times 79.2[/tex]

[tex]area = 39.6 {cm}^{2} [/tex]

 Answer: The area is 39.6

Step-by-step explanation:

First multiply 5.5×5.5= 30.25

Then subtract 8.9 - 5.5=3.4

Then multiply 5.5 x 3.4=18.7

Divide 18.7/2=9.35

Add 30.25 + 9.35 =39.6

b x h ÷2

[tex]l *w=a[/tex]

Hope this helps.

Answer:

b

Step-by-step explanation:

The correct answer for the given problem above would be option B.

⇒ Fran must work 17 hours per week to meet her goal.

Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

Now, According to the given details,

Fran works 15 hours per week for $225 which makes it $15 per hour.

Hence, If she adds another 2 hours per week to make it 17 hours,

Then, she will earn $255 dollars per week.

Now, since she is saving $40 dollars plus the two hours which is $30, a total of $70 per week of savings, multiplied by 20 weeks, then, she will be able to get $1,400.

Hence, The correct answer for the given problem above would be option B.

⇒ Fran must work 17 hours per week to meet her goal.

Learn more about the mathematical expression visit:

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Answer: 77 percent

Step-by-step explanation:

The value of the stock decrease by 23.13%.

The difference between starting and final numbers is the percentage drop. It displays a percentage loss of value compared to the original regardless of the units. The difference between the initial and final amounts is the amount of decline.

Given:

The price of the stock was $35.48.

Then The price of the stock is $27.36.

So, the decrease in amount= 35.48 - 27.36 = 8.12

Then, percent decrease

= 8.12/ 35.48 x 100

= 23.13%

Hence, the percent decrease is 23.13%.

Learn more about Percent Decrease here:

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Answer:

x+3

Step-by-step explanation:

sqrt(x^2+6x+9)

factor

We know this is a perfect square trinomial

sqrt(( x+3)^2)

Taking the square root of a square

x+3

B.) | 12, 7, 17, -22 |

The complete question is attached below:

A set of numbers arranged in rows and columns so as to form a rectangular array.

Given:

[tex]\left[\begin{array}{ccc}12&-13\\17&-22\end{array}\right]* \left[\begin{array}{ccc}x\\y\end{array}\right] = \left[\begin{array}{ccc}7\\-51\end{array}\right][/tex]

  [ 12x - 13 y

   17x - 22y ]     =  [tex]\left[\begin{array}{ccc}7\\-51\end{array}\right][/tex]

As we need to find Ay for that the matrix on RHS of equal sign [tex]\left[\begin{array}{ccc}7\\-51\end{array}\right][/tex] is to be putted in the matrix  [tex]\left[\begin{array}{ccc}12&-13\\17&-22\end{array}\right][/tex]  

Hence, Ay = [tex]\left[\begin{array}{ccc}12&7\\17 & -51\end{array}\right][/tex]

Learn more about matrix here:

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Answer:

[tex]ange a is 5[/tex]

angle b is 20

Answer:

angle a is 40

angle b is 20

amgle c is 120

Step-by-step explanation:

Answer:

b.

Step-by-step explanation:

Answer:

b) 75

Step-by-step explanation:

The totalnumber of combinations are: 5×3×5 = 75

You have 5 choices for a drink and for each drink you have 3 choice for a sandwich and for each chosen sandwich you have 5 choices for a side.

a combination is :

( drink , sandwich, side )

  5      ×    3         ×  5

Answer:

35:50 would be the probability:)

Answer:

67

Step-by-step explanation:

Answer:

67

Step-by-step explanation:

Answer:

Refer to the screenshots provided

Answer: look at the screenshots

Step-by-step explanation: Hope it helps ;)