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

why are they letters in math for

5th, 2 3/4 + 1 1/4 =

2 3/4 + 1 1/4 =

Linear combination(elimination), x-y=11 x+y=19

x-y=11 x+y=19

Addition, how much is 101+200+

how much is 101+200+

Word problems, Five star coffee charges a 40 dollar start up fee and then 8...

Five star coffee charges a 40 dollar start up fee and then 8 dollars per month. Custom coffee company charges a 25 dollar start up fee and 12.50 dollars per month. In which time fr

Find the Quotient, (2x^2+16x+24)/(3x^2) /(x+6)

(2x^2+16x+24)/(3x^2) /(x+6)

Algebra 1 honors unit 7 polynomials and factoring, x squred y+ x

x squred y+ x

Quadratic equations,

Simplify, 3_-1 x+2 --- 1+_2 x+2

3_-1 x+2 --- 1+_2 x+2

Verbal problem, A bullet is shot upwards with an initial velocity of 100 ft...

A bullet is shot upwards with an initial velocity of 100 ft/sec from a point 12 ft above the ground, and its height above the ground at time t is given by h(t)= -16t^2 + 100t +12