The equation 12x + 15y = 390 represents the total revenue during a one-day fundraiser. in the equation, x represents the number of youth t-shirts sold, and y represents the number of adult t-shirts sold. if there were 10 youth t-shirts sold, how many adult t-shirts were sold?
a. 18 t-shirts
b.20 t-shirts
c.24 t-shirts
d.45 t-shirts

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.

constant of proportionality = 3 and the equation is c = 3p.

step-by-step explanation:

c = kp   where c = amount of caffeine in mg., p = oz of pepsi and k is the constant of proportionality.

substituting the values given:

24 = 8k

k = 3.

the same value of k will be obtained if we substitute the other given values.