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3 years ago

Need by midnight pretty simple i just don't know how to explain it.

Mathematics

1 answer:

weqwewe [10]3 years ago

4 0

Answer:

Side x is adjacent to 30° angle.

Correct method is:

cos 30° = x/15 ⇒ x = 15*cos 30° ⇒ x = 12.99

Diego is correct and Steven is wrong.

when finding sine consider the opposite side to the angle, not hypotenuse
when finding cosine consider adjacent side to the angle, not hypotenuse

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I NEED ANSWERS 8x-7y=10 for y

Degger [83]

Answer: y = -10/7 + 8x/7 x = 5/4 + 7y/8

Step-by-step explanation: Move all terms that don't contain y to the right side and solve. Move all terms that don't contain x to the right side and solve.

7 0

3 years ago

A spherical balloon is inflating with helium at a rate of 64 pi StartFraction ft cubed Over min EndFraction . How fast is the b

olga2289 [7]

Answer:

The radius of the balloon is increasing at a rate of 4 feet per minute.

Step-by-step explanation:

We are given the following in the question:

$\dfrac{dV}{dt} = 64\pi \dfrac{\text{ ft}^3}{\text{min}}$

Volume of sphere is given by

$V = \dfrac{4}{3}\pi r^3$

where r is the radius of the balloon.

Instant radius, r = 2 ft

Rate of change of volume =

$\dfrac{dV}{dt} = \dfrac{d}{dt}(\dfrac{4}{3}\pi r^3)\\\\\dfrac{dV}{dt} =4\pi r^2\dfrac{dr}{dt}$

Putting values, we get,

$64\pi = 4\pi (2)^2\dfrac{dr}{dt}\\\\\Rightarrow \dfrac{dr}{dt} = 4$

Thus, the radius of the balloon is increasing at a rate of 4 feet per minute.

5 0

3 years ago

a rectangle is a four sided flat shaped where every interior angles is a right angle. Therefore, opposite sides aRE PARALLEL and

Schach [20]

This is true. There is no question connected which is why there are no answers!

5 0

3 years ago

2 times a number decreased by 2 is 38. What is the number?

iogann1982 [59]

20

2 x 20= 40 - 2= 38

i think that’s right?

7 0

3 years ago

Read 2 more answers

Mike got a 45% discount when he bought a new jacket. Which of the following is NOT equivalent to 45%?

MariettaO [177]

Answer:

4/5 is NOT equivalent to 45%

Step-by-step explanation:

4/5 = 80%

4 0

3 years ago

Need by midnight pretty simple i just don't know how to explain it.​

Need by midnight pretty simple i just don't know how to explain it.