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Slav-nsk [51]
3 years ago
6

Can someone show me what i did wrong? x is supposed to equal 2

Mathematics
2 answers:
poizon [28]3 years ago
8 0
In step 3, you added 8x onto the other side instead of subtracting it from 15x.
Valentin [98]3 years ago
3 0

\bf \begin{array}{rllll} 3(5x-4)&=&8x+2\\\\ 15x-12&=&8x+2\\\\ 7x-12&=&2&\leftarrow \textit{notice here}\\\\ 7x&=&14\\[1em] x&=&\cfrac{14}{7}\\[1em] x&=&2 \end{array}

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A ball is kicked in the air. The height of the ball can be calculated using the equation h(t) =-16t^2+64t+190, where h is in hei
gregori [183]

Answer:

Therefore the ball strikes the ground  5.98 s after kick.          

Step-by-step explanation:

Given that , a ball is kicked in the air. The height of the ball can be calculated using the equation h(t)=-16t^2+64t+190    where h is height in feet and t is time in second.

When the ball touches the ground then the height will be zero.

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Therefore

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Since -2≠0 then (8t^2-32t-95)=0

(8t^2-32t-95)=0    

[The solution of a quadratic equation ax²+bx+c=0 is

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\Rightarrow t =\frac{-(-32)\pm\sqrt{(-32)^2-[4\times8\times(-95)]} }{2\times8}        

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Therefore   t=  5.98 or -1.98

since time can not be negative So , t=5.98 s

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3 years ago
Which of the following best describes LCM?
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Answer:

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Step-by-step explanation:

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