The answer is 87. it was quite simple
Answer:
without numbers= 10x + 15y = 120
Step-by-step explanation:
grocery store= 10x (x=8 in this case)
music lessons= 15y
10 cookies in a 8 day period
? cookies in a 12 day period
10 cookies in a 8 day period
Divide both numbers by 2
5 cookies in a 4 day period
Multiply both numbers by 3
15 cookies in a 12 day period.
You will eat 15 cookies in a 12 day period.
Formula of Area of triangle.... A=1/2bh where A is area, b is the base, and h is height.
h= 3b-1
Area=12
At this point you want to plug in what you know into the equation.
12=1/2b(3b-1)
Then you can solve for b. First multiply each side by 2 to cancel the fraction.
24=b(3b-1)
Then distribute the b term.
24=3b^2 - b
Then set the equation equal to zero.
0=3b^2-b-24
Then either factor or use the quadratic equation to solve for b.
0=(3b-8)(b-3)
which means that b=3 and b=8/3
You then plug both answers back into the original equation (12=1/2b(3b-1))and see if there are any extraneous solutions. When you do, you can see that 8/3 as an answer does not equal 12. Therefore, the correct answer and the base of the triangle is equal to 3.
The answer is C. If you subtract the lesser amount from the greater amount then you get the difference between the two and how far they were to each other. Maybe Jamal needs to get more exercise to beat Kylie.