FOIL method
First:
u squared times u squared equals to u to the fourth.
Outer and Inner:
8u squared + u squared equal 9u squared. Remember, the exponents don't change when adding!
Last:
8 times 1 equals 8
Answer:
y=7x+1/7
Step-by-step explanation:
Your points (8,8) and (6, -6) can easily be find the slope using (y2-y1) / (x2-x1)
This slope results in 14/2 or 7.
Find the b-value is simple - plug in your 7 into the equation, y=7x+b, then use an existing point on the line to find the b-value. In this case, I used the (8, 8) point.
After plugging in, simply divide to get numbers on the opposite side of variable, and you will end up with 1/7.
The equation turns out to be y=7x+1/7.
Going from the left to the right. 9, 4, 13, 15, 12, 6, 11. The total cost is the sum of these, or $70,000.
The best step to do next is to add 80 to both sides of equation:
5 ( x² + 8 x ) + 80 = 14 + 80
and since 80 = 5 · 16
5 ( x² + 8 x + 16 ) = 94 Answer : B )
After that we will continue like this:
5 ( x + 4 )² = 94
( x + 4 )² = 18.8 ... etc
