3 years ago

If 40% is equal to the fraction X over 30 what is the value of X

Mathematics

1 answer:

Fofino [41]3 years ago

6 0

Answer: the answer is 12

Step-by-step explanation:

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What is the circumference of this circle?

Yanka [14]

C ≈ 307.88
Hope that helps.

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3 years ago

A projectile is launched into the air. The function h(t) = –16t2 + 32t + 128 gives the height, h, in feet, of the projectile t s

Zinaida [17]

Answer:

t = 4 seconds

Step-by-step explanation:

The height of the projectile after it is launched is given by the function :

$h(t)=-16t^2+32t+128$

t is time in seconds

We need to find after how many seconds will the projectile land back on the ground. When it land, h(t)=0

So,

$-16t^2+32t+128=0$

The above is a quadratic equation. It can be solved by the formula as follows :

$t=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}$

Here, a = -16, b = 32 and c = 128

$t=\dfrac{-32\pm \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}\\\\t=\dfrac{-32+ \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}, \dfrac{-32\- \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}\\\\t=-2\ s\ \text{and}\ 4\ s$

Neglecting negative value, the projectile will land after 4 seconds.

4 0

3 years ago

Which of the following lines is perpendicular to the equation given below?

g100num [7]

I think it’s gonna be C

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3 years ago

Read 2 more answers

300% of 7 is what percent of 42?<br> A. 30%<br> B. 50%<br> C. 60%<br> D. 12.5%

liubo4ka [24]

Answer:

B. 50%

Step-by-step explanation:

Step by step by me I guess

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1 year ago

Please solve these for 20 points : solving formulas for a variable

Digiron [165]

6. (A/pi = r^2)
7. [(P - 2l)/2 = w]
8. [C/(2pi)= r]
9. (2A/h = b)
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3 years ago