Jamie purchased a dvd that was on sale for 15% off. the sales tax in her county is 5%. that i represent the original price of the dvd. write an expression that can be used to determine the final cost of the dvd.
a. y - 0.15y
b. 0.05(0.85y)
c. y - 0.85y + 0.05y
d. 1.05 (0.85y)

hello from mrbilldoesmath!

answer:   x^2 + y^2 = 1024

discussion:

the equation of a circle with center (h,k) and radius "r" is

(x-h)^2 + (y-k)^2 = r^2.

in our case

(x-0)^2 + (y-0) ^2 = 32^2 = 1024

you,

mrb

1st integer x

2nd integer x+1

3rd integer x+2

4th integer x+3

x+x+1 +x+2+x+3 =74

combine like terms

4x+6 = 74

subtract 6 from each side

4x = 68

x = 17

the integers are 17,18,19,20