Answer:
D. using coupons on regular purchases.
Let
x--------> the amount in dollars that Luis make last week
we know that
------> equation that represent the situation
solve for x
Divide by 
both sides
therefore
<u>the answer is</u>
If the coin is fair, the probability of a success on each roll is 0.5.
You cannot round on a calculator (at least the type I use). You need to learn how to do it yourself, if you are required to round to 3sf look at the 4th digit if it is greater than 5 you round the 3rd digit up and if the 4th digit is less than 5 leave the 3rd digit as it is
eg. 66.7223838
= 66.7
eg2. 657892354
= 658000000
the answer for this question is 64-144a+108a^2-27a^3
