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nevsk [136]
2 years ago
7

Find the area of a semi circle with a diameter of 28cm

Mathematics
1 answer:
Alexandra [31]2 years ago
8 0

since it has a diameter of 28, then its radius must be half that or 14.

\textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=14 \end{cases}\implies A=\pi (14)^2\implies A=196\pi ~\hfill \stackrel{\stackrel{semi-circle}{half~that}}{98\pi }

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Find the length of the hypotenuse. Round your<br> answer to the nearest hundredth.
sergij07 [2.7K]

Answer:

8.06

Step-by-step explanation:

a^2 + b^2 = c^2

4^2 + 7^2 = c^2

16 +  49 = c^2

65= c^2

Find the square root of 65

8.06

3 0
3 years ago
F(x)=9(x-8) find f^-1(x)
mina [271]

Answer:

f^{-1}(x) = \frac{1}{9} x + 8

Step-by-step explanation:

let y = f(x) and rearrange making x the subject, that is

y = 9(x - 8) ← divide both sides by 9

\frac{y}{9} = x - 8 ( add 8 to both sides )

\frac{y}{9} + 8 = x

Change y back into terms of x with x = f^{-1}(x) , thus

f^{-1}(x) = \frac{1}{9} x + 8

8 0
3 years ago
To lose one pound of fat, a 200-pound person must burn 3,500 calories. If that person burns 180 calories by walking for 30 minut
SVEN [57.7K]

Answer:

C - 19 hours 27 minutes

Step-by-step explanation:

180 × 2 = 360

360 calories in an hour

3500 × 2 = 7000 (amount of calories in 2 pounds)

7000 ÷ 360 = 19.4444...


I hope this helps


4 0
2 years ago
A company tests all new brands of golf balls to ensure that they meet certain specifications. One test conducted is intended to
docker41 [41]

Answer:

385 golf balls

Step-by-step explanation:

margin of error = (z*)(s) / sqrt n

where z* = 1.96 with 5%/ 2 = 0.025 area in each tail

margin of error = (z*)(s) / sqrt n

1.2 yards = (1.96)(12 yards) / sqrt n

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n = 384.16

385 golf balls (always round up)

3 0
3 years ago
Solve (6b^2+5)+(8b-20)
Lisa [10]

The sum of the given expression is 6b^2+8b-15

<h3>Sum of expression</h3>

Given the following expression

(6b^2+5)+(8b-20)

We are to take the sum. On expansion;

6b^2+5 + 8b-20

Collect the like terms

6b^2+8b +5 - 20

6b^2+8b-15

Hence the sum of the given expression is 6b^2+8b-15

Learn more on sum of expression here: brainly.com/question/723406

#SPJ1

7 0
1 year ago
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