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ohaa [14]
2 years ago
11

154 sq. cm is the area of a circle so find its radius

%7D" id="TexFormula1" title="\pi =\frac{22}{7}" alt="\pi =\frac{22}{7}" align="absmiddle" class="latex-formula">
Mathematics
1 answer:
Zina [86]2 years ago
6 0

Answer:

r = 7 cm

Step-by-step explanation:

The area (A) of a circle is calculated as

A = πr² ( where r is the radius )

Given A = 154 , then

πr² = 154 , that is

\frac{22}{7} r² = 154 ( multiply both sides by 7 to clear the fraction )

22r² = 1078 ( divide both sides by 22 )

r² = 49 ( take square root of both sides )

r = \sqrt{49} = 7 cm

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Bob can paint a fence in 12 hours, and working with Jen can paint a fence in 4 hours. How long would it have taken Jen to paint
butalik [34]

Answer:

6 hours

Step-by-step explanation:

For Bob

12 hours = 1 fence

1 hour = 1/12 fence

Together Bob and Jen

4 hours = 1 fence

1 hour = 1/4 fence

Now, for Jen:

1 hour = 1/4 - 1/12= 3/12 - 1/12 = 2/12=1/6

Find the amount of time Jen will need:

1/6 fence = 1 hour

1 fence = 6 hour

8 0
2 years ago
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Mashcka [7]

Answer: 5:4

Step-by-step explanation: you divide them i believe :)

7 0
3 years ago
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X + 5 = 75<br> Solve for the variable
IgorLugansk [536]

First, isolate the variable

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Hope I helped!

Good Luck!


7 0
3 years ago
Read 2 more answers
Connor and Angie helped take attendance during their schools practice fire drill if the actual count was between 77 and 89 inclu
wel

Answer:

The most absolute error is 12

Step-by-step explanation:

The formula for absolute error is given by the following relation;

Absolute error, Δx = Value measured, x₀ - Exact (actual) value, x

Δx = x₀ - x

Since the actual count is between 77 and 89, the maximum absolute error will be where the actual value = 77 and the measured value = 89 and vice versa, giving an absolute error of 89 -77 = 12.

The most absolute error = 12.

4 0
3 years ago
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