Last year, 25 students signed up for a summer trip to California. This summer, 18 students have signed up to go. What is the percent decrease in the number of students?
STEPS:
1. Follow the following formula.
amount of change/original amount = x/100
2. Cross multiply the ratios
3. Solve for x by dividing each side by the coefficient.
O 40% decrease
O 56% decrease
O 28% decrease
O 21% decrease

1. credits

2. dual - aspect

hope i : )

d? maybe

step-by-step explanation:

3+x

step-by-step explanation:

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb