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A direct proportion occurs when you have a direct relationship between one component and another, where an inverse proportion occurs when one component has an opposite effect on the other. For example, let's use the equation for density:
D= m D= density ...

To solve this, you must distribute 8v to the terms inside the parentheses by multiplying 8v by each term separately, so:
8v(v-10)
8v2-80

We need to evaluate the function, f(x) = x2+2x+3, by substituting f(-9), f(x+1) and f(-x). This means that we substitute the values given to us in place of each x in the equation.
So the value, f(-9), means we will substitute -9 in the original equation for x:
f(-9) = (-9)2+2(-9)+3
f(-9)...