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3 years ago

The sum of seven and the quotient of a number x and eight

Mathematics

2 answers:

salantis [7]3 years ago

6 0

7 + (x/8) in written form. I hope this helps! -Dan

KiRa [710]3 years ago

5 0

X÷8=7
here is how I got it...

The sum of seven soo... sum mean equals soo... something equals seven
and the quotient soo... quotient equals divide soo... what we have here right now is x÷x=7 (x is what we dont know)
number x and eight soo... x÷8=7

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3 years ago

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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

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t = 4 seconds

Step-by-step explanation:

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

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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.

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3 years ago