Vlad spent 20 minutes on his history homework and then completely solved x math problems that each took 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 ?
Answer
A
y is equal to 2 x plus 20 ; x is any integer greater than or equal to 0 , and y is an integer greater than or equal to 20 .
B
y is equal to 2 x plus 20 ; x is any real number greater than or equal to 0 , and y is any real number greater than or equal to 20 .
C
y is equal to 20 x plus 2 ; x is any integer greater than or equal to 0 , and y is an integer greater than or equal to 20 .
D
y is equal to 20 x plus 2 ; x is any real number greater than or equal to 0 , and y is any real number greater than or equal to 20 .