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3 years ago

WHAT IS X IF THE EQUATION IS X - 3 = 6?

Mathematics

2 answers:

kondor19780726 [428]3 years ago

7 0

Answer:

Step-by-step explanation:

Add 3 to the 6 and that will get rid of the 3. You will get 9.

x - 3 = 6

x -3 + 3 = 6 + 3

x = 9

Have an amazing day!

PLEASE RATE!

cestrela7 [59]3 years ago

4 0

Answer:

Step-by-step explanation:

You substitute 9 for x and 9 - 3 = 6

I hope it helps! Have a great day!
Muffin ^^

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The debris will be at a height of 56 ft when time is <u>0.5 s and 7 s.</u>

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Rewriting the above equation into a standard quadratic equation and solving for 't', we get:

$-16t^2+120t-56=0\\\textrm{Dividing by -8 throughout, we get}\\\frac{-16}{-8}t^2+\frac{120}{-8}t-\frac{56}{-8}=0\\2t^2-15t+7=0$

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$t=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\\\\t=\frac{-(-15)\pm \sqrt{(-15)^2-4(2)(7)}}{2(2)}\\\\t=\frac{15\pm \sqrt{225-56}}{4}\\\\t=\frac{15\pm\sqrt{169}}{4}\\\\t=\frac{15\pm 13}{4}\\\\t=\frac{15-13}{4}\ or\ t=\frac{15+13}{4}\\\\t=\frac{2}{4}\ or\ t=\frac{28}{4}\\\\t=0.5\ s\ or\ t=7\ s$

Therefore, the debris will reach a height of 56 ft twice.

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Again after reaching maximum height, the debris falls back and at $t=7\ s$ , the height is 56 ft.

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