Why are they y and z in math, why are they letters in math for

why are they letters in math for

Kenneth, brody rode his bike 70 miles in 4 hours. he rode at an average spe...

brody rode his bike 70 miles in 4 hours. he rode at an average speed of 17 mph for t hours and at an average rate of speed of 22 mph for the rest of the time. how long did brody ri

Expressions, what is the expression. Of 1=1/2n(3n-1)

what is the expression. Of 1=1/2n(3n-1)

Simplifying and comparing expressions in radical form, # how do I solve (4^...

# how do I solve (4^16)1/2

Vertical angles,

For a Good Cause, a car wash at the local gas station costs $10.95 includin...

a car wash at the local gas station costs $10.95 including tax. How many car washes can you get at the gas station and still pay less than Plan A: 3 Coupons Coupon Booklet $32.99 P

Inequalities, Nicole has just finished writing a research paper. She has ...

Nicole has just finished writing a research paper. She has hired a typist who will type it. The typist charges $3.50 per page if no charts or graphs are used and $8.00 per pag

Graphing linear equations, what is the answer to y is greater than 3x-l and...

what is the answer to y is greater than 3x-l and y is less than x+2

Precalculus help--Dividing complex numbers, 5-i/ 3+4i

5-i/ 3+4i

#title., if x=7 an y=9 and the answer is 98 what is the expresson?

if x=7 an y=9 and the answer is 98 what is the expresson?