Vlad spent 20 minutes on his history homework and then completely solved x math problems that each took 2 minutes to complete. W
hat 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? A y=2x+20; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20.
B y=2x+20; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20.
C y=20x+2; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20.
D y=20x +2; x is any real number greater than or equal to 0, and y is any real number greater than or equal to 20.
<span>y = 2x + 20. Choice A is correct. Reasoning: Vlad first spends 20 minutes on his history assignment and then completes x math problems. Each math problem requires 2 minutes, so the time for math is 2x. Adding the two parts gives total time y = 20 + 2x, with x ≥ 0 and y ≥ 20.</span>
For Paul, the calculation is 2550 * 0.2 = 510. For Kevin, it's 2550 * 0.25 = 637.5. Justin's calculation is 2550 * 0.3 = 765. Lastly, David's portion, calculated as 2550 minus the others' contributions, results in 637.5.
