Vlad spent 20 minutes on his history homework and then completely solved x math problems that each to 2 minutes to complete. What is the equation that can be used to find the value of y, the total time that vlad spent on his homework, and what are the constraints on the values of x and y?

6.5

step-by-step explanation:

you said it was in the question

~courtney

b. x + 1

step-by-step explanation:

i'am smart

you'll just earn points here

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.