HELP I NEED HELP ASAP 11 and 12 WILL MARK BRAINLIST

Mathematics

2 answers:

zmey [24]3 years ago

8 0

1. 278.25
3.14 x 5 x 5 x 1/2= 39.25
10 x 8 x 6 x 1/2= 240

Thepotemich [5.8K]3 years ago

8 0

Answer:

11. 24+25pi

12. 28

Step-by-step explanation:

Triangle area: 8 x 6 x 1/2=24 ft^2

Semi circle area: 5^2pi

Figure area: 24+25pi

12. Count outer squares: 28

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Damm [24]

Answer: Choice D. $6.44 \times 10^{-4}$

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Work Shown:

We multiply the coefficients 9.2 and 7 to get 64.4, which is the same as 6.44*10^1 in scientific notation. When multiplying exponential expressions with the same base, we add the exponents

This is what the steps could look like

$\left(9.2 \times 10^{-9}\right)\times\left(7 \times 10^{4}\right)\\\\\left(9.2\times7\right)\times\left(10^{-9} \times 10^{4}\right)\\\\\left(64.4\right)\times\left(10^{-9+4}\right)\\\\\left(6.44\times 10^{1}\right)\times\left(10^{-5}\right)\\\\6.44\times\left(10^{1}\times 10^{-5}\right)\\\\6.44\times\left(10^{1+(-5)}\right)\\\\6.44\times 10^{-4}\\\\$