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liubo4ka [24]
3 years ago
12

Y is 5 when x is 2.5, and y varies directly with x.. Find y when x is 10.. 5. 7.5. 12.5. 20

Mathematics
1 answer:
Firlakuza [10]3 years ago
3 0
Most of the information's required for solving this problem is already given in the question. Let us write them down first and then concentrate on the problem in hand.

When y = 5, then x = 2.5
So
y = kx
5 =2.5k
k = 2
Now, when x = 10, then
y = kx
  = 2 * 10
  = 20
From the above deduction, we can conclude that the correct option among all the options that are given in the question is the last option.
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The binomial x-2 is a factor of the polynomial below. f(x)=x3+x2+nx+10 What is the value of n?
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<h3>Answer: n = -11</h3>

=========================================================

Explanation:

Since x-2 is a factor of f(x), this means f(2) = 0.

More generally, if x-k is a factor of p(x), then p(k) = 0. This is a special case of the remainder theorem.

So if we plugged x = 2 into f(x), we'd get

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