Define a variable and write an equation for each real-world problem. 1] matt spent $ 6.50 on his lunch. this is $2.25 more than his friend jackson spent on his lunch. how much did jackson spend on his lunch?

M will represent Matt and J is Jackson.  M-2.25=J. You minus the difference between them and show that it equals to Jacksons. A variable is a number in math that can vary.

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.