Somebody please help me !!!!

Mathematics

1 answer:

Stells [14]3 years ago

7 0

Answer:

First use this formula= V=4/3πr^3

r=radius

Step-by-step explanation:

answer: 2144.66 I think. I might be wrong. Please let me know if I'm wrong.

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Howdy! Id love to have these questions answered asap! Thank you for the help!

tiny-mole [99]

Answer:

1. B.

2. B.

Step-by-step explanation:

Trigonometry

1) Coterminal angles can be found by adding or subtracting 360° (or 2\pi radians) to a given angle. If we have 120°, adding 360° gives 480°, adding again 360° gives 840°. There is no way to get -180°, so this option is not a coterminal angle to 120°

A. $Cos (-90^o)=0$ , and not undefined

B. $Sin (-90^o)=-1$ . This is correct

C. $Tan (-90^o)$ is undefined, not zero

Thus the only correct option is B.

8 0

3 years ago

A 70-ft ladder is mounted 10 ft above the ground on a fire truck. The bottom of the ladder is 40

riadik2000 [5.3K]

$\text{Hello there!}\\\\\text{Use the Pythagorean theorem first:}\\\\a^2+b^2=c^2\\\\\text{Plug 70 to c since it's your hypotenuse and plug 40 to a}\\\\40^2+b^2=70^2\\\\\text{Solve for b:}\\\\40^2+b^2=70^2\\\\1600+b^2=4900\\\\\text{Subtract 1600 from both sides}\\\\b^2=3300\\\\\text{Square root}\\\\b=57.4456\\\\\text{Round to the nearest tenth}\\\\57.4\\\\\text{Add 10 to 55.4 because the ladder is 10 ft off the ground}\\\\67.4\\\\\boxed{\text{Answer: about 67.4 ft}}$