Answer:
Step-by-step explanation:
It appears to be the last step there that has evaded you. In the second line of work, you can see that what's in each set of parenthesis is exactly the same. Because of this, it is common and can be factored out. What's left is the 4x and the +5:
(5x - 3)(4x + 5)
That's factoring by grouping. It only works with polynomials that have an even number of terms so you can group them together in 2's.
The percent change is a 450% increase in the cost of advertisements.
It is just a parameter because a quantity whose value is selected for the
particular circumstances and in relation to which other variable quantities may
be expressed. The quantity, 30, is just selected from the 55 total
states.
<span>If
the areas of 50 states are added and the sum is divided by 50, then this would
be the average area of the state which is statistics. </span>
<span> </span>
7x5000 for part a and 21x5000 for part be the rest you just have to solve it on your own