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Arlecino [84]
3 years ago
5

What does 2b+9 when b=3 like the hell

Mathematics
2 answers:
BabaBlast [244]3 years ago
5 0
You plug 3 into B so 2(3) + 9 = 15
beks73 [17]3 years ago
3 0
So let’s start from the beginning. 2 is by B, so that means we have to MULTIPLY 2 by whatever B equals. B equals to 3, so we have to multiply 2 by 3, which equals 6. Then, we add 6 and 9, which is 15. Your final answer is 15. Hope that helps!
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we know that:

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(i suppose x in seconds and y in meters)

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(1s, 0m).

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8m = a*(-1s)^2 + b*-1s + c

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First we should isolate one variable in the third equation, and then replace it in one of the other two:

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So we can replace b in the first two equations bi 1s*2a.

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c = -a*3s^2

The first equation becomes:

8m = -a*1s^2 - a*3s^2 = -a*4s^2

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Now with a, we can find the values of c and b.

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b = 1s*2a = 1s*(-2m/s^2) = -2m/s.

Then the equation is:

y = (-2m/s^2)*t^2 + (-2m/s)*t + 6m

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2 years ago
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