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Zolol [24]
3 years ago
14

If r + t = 10 and -r + t = 4, What is the value of 5r + 8t?

Mathematics
1 answer:
ikadub [295]3 years ago
7 0

Answer:

71

Step-by-step explanation:

Start solving using simultaneous equation,From there, we have r to be 3 and t to be 7

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If f(x) = x^2 — 3x, explain how to find f(—1.8).
gogolik [260]

Answer:

Plug -1.8 into each x so the equation would become (-1.8)^2 - 3(-1.8)

Step-by-step explanation:

5 0
4 years ago
The position function of a particle in rectilinear motion is given by s(t) = 2t^3 + 21t^2 + 60t + 3 for t ≥ 0 with t measured in
natta225 [31]
As the fellow above said, the particle does make a U-turn at the vertex, and we can find that out by getting the derivative of s(t) and zeroing it out to get the point of the horizontal tangent.

Bearing in mind that ds/dt is really v(t) or the velocity equation, so when we zero out the ds/dt, is the same as saying the velocity went to 0, since it got zeroed out, and then the particle goes over the vertex and changes direction.

\bf s(t)=2t^3-21t^2+60t+3\implies \boxed{\cfrac{ds}{dt}=6t^2-42t+60}\leftarrow v(t)
\\\\\\
0=6t^2-42t+60\implies 0=t^2-7t+10\implies 0=(t-5)(t-2)
\\\\\\
t=
\begin{cases}
5\\
2
\end{cases}\impliedby \textit{it makes the first turn at the \underline{2 second}}
\\\\\\
\textit{now let's find the acceleration equation, a(t)}
\\\\\\
\boxed{\cfrac{d^2s}{dt^2}=12t-42}\leftarrow a(t)\\\\
-------------------------------\\\\
s(2)=55\qquad \qquad \qquad \qquad a(2)=-18

the negative acceleration value, simply means a decreasing rate of change, so, it means the particle is slowing down and possibly coming to a stop before changing direction again.
8 0
3 years ago
Help me I will award the person that’s correct
Dimas [21]
46 meters in total i think
6 0
3 years ago
Make a plan there are 100 books in the library. there are non - fiction and fiction books write the fraction of the books that a
baherus [9]
I am guessing there is half of each type of book, so there are 50/100 or 1/2 that are fiction

hope this helped
4 0
3 years ago
A publishing company is going to have 24,000 books printed. There are between 3 and 4 out of every 3,000 printed that will have
ivann1987 [24]
24000(total books) / 3000(batch of books with amount of errors known) = 8

8*3 = 24,
8*4 = 32

There will be between 24 and 32 printing errors.
5 0
4 years ago
Read 2 more answers
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