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3 years ago

Evaluate the expression. Write your answer in scientific notation.

Mathematics

1 answer:

krok68 [10]3 years ago

5 0

1. 4.47 x 10^3
2. 4.8 x 10^8

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A circle has an area of 50 square meters. Which answer is closest to the measure of its diameter?

gregori [183]

Area of a circle is computed by multiplying pi to the square of the circle's radius.

A = πr²
50m² = 3.14 r²
50m²/3.14 = r²
r² = 15.92m²
r = √15.92m²
r = 3.99m

Diameter is computed by multiplying the radius twice.
d = 2r
d = 2(3.99m)
d = 7.98m or rounded up to 8 m

8 0

3 years ago

7. Cell phone plan A costs $30 per month for unlimited calling plus $0.25 per GB of data. Cell phone plan B

Lesechka [4]

Answer:

Part a) The linear model that represents the monthly cost of each plan is

Plan A

$y=0.25g+30$

Plan B

$y=0.15g+40$

Part b) The plans cost the same for 100 GB of data

Step-by-step explanation:

Part a) Write a linear model that represents the monthly cost of each plan if the customer uses g GB of data

Let

g -----> the GB of data

y -----> the monthly cost

we know that

The linear equation that represent each plan is equal to

Plan A

$y=0.25g+30$ ----> equation A

Plan B

$y=0.15g+40$ ----> equation B

Part b) After how many GB of data will the plans cost the same?

Equate equation A and equation B and solve for g

$0.25g+30=0.15g+40$

$0.25g-0.15g=40-30$

$0.10g=10$

$g=100\ GB$

therefore

The plans cost the same for 100 GB of data

7 0

4 years ago

Solve 4x + 5 > 5x − 2 for x.

garik1379 [7]

Answer:

20x

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

2. Bella's cell phone costs $18 per month plus $0.15 for every minute she uses the phone. Last month her bill was $29.25. For ho

Alex777 [14]

Hello! So in order to solve this problem, it's best to start off making an equation. $18 + $.15x = $29.25

In this equation x represents the number of minutes she used. So now, we just have to solve for x.

First subtract $18 from both sides. Your new equation will be $.15x = $11.25. Then divide both sides by $.15 to get x by itself. $11.25/$.15 = 75.

So we can conclude that Bella spoke on the phone for 75 minutes this last month. Hope this helps!

8 0

4 years ago

Will mark you brainliest for the best answer! Find the exact length of arc ADC . In your final answer, include all of your calcu

nevsk [136]

Answer:

360 whole circle minus the 60 you don't want =300

Step-by-step explanation:

4 0

2 years ago