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damaskus [11]
3 years ago
10

Please help

Mathematics
1 answer:
rewona [7]3 years ago
5 0

Answer:

125.6m^2

Step-by-step explanation:

Let R be the greater radius and r be the smaller radius

Area of the sidewalk = R^2 - r^2 - This can be the expression

= 3.14

=(R^2-r^2)

=(11^2-9^2)

=(121-81)

= 40

= 3.14 x 40

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Norma-Jean [14]

Answer:

No idea

Step-by-step explanation:

8 0
3 years ago
A baseball player hits a pitched ball when it is 4 ft above the ground. The initial upward velocity is 80 ft/s. How
iren [92.7K]

Answer:

t=+4.06

Step-by-step explanation:

when the baseball hits the ground, the height will be 0.

h=0we are given that h=−16t2+64t+4.

this means that the height is 0 when −16t2+64t+4=0.−16t2+64t+4=0divide both sides by 4:−4t2+16t+1=04=0−4t2+16t+1=0 can be solved using the quadratic formula:t=−b±√b2−4ac2a, where at2+bt+c=0.at2+bt+c=−4t2+16t+1a=−4,b=16,c=1t=−b+√b2−4ac2aor−b−√b2−4ac2a−b+√b2−4ac2a=−16+√272−8=−0.06..−b−√b2−4ac2a=−16−√272−8=4.06 (3s.f.)we have 2 values for t:−0.06 and 4.06.

since time cannot be negative, only the positive value can be taken.

this is 4.06, to 3 significant figures.the time taken is 4.06 seconds.

7 0
2 years ago
I buy a car for 24,000 dollars. My car depreciates 11% per year. How much will it cost after 5 years?
andrey2020 [161]
24000x0.11x5

then solve.
7 0
3 years ago
Questions 3-5 please and thank you
vekshin1

Answer:

too far away and too blurry cant see it

7 0
3 years ago
4/49 times 7/13 thank you
german

Answer:

0.04395604395

Step-by-step explanation:

5 0
3 years ago
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