Tutor profile: Alicia A.

Evaluate the expression x + y when x = 2, y = 4

To evaluate the expression, substitute the values of x and y into the expression. So x + y becomes 2 + 4, and you simplify the expression to 6.

8 is what percent of 40?

To find the percentage, divide 8 by 40. This is a proper fraction, and can be simplified to 2/10 by dividing the numerator and denominator by 4. You can convert this fraction into the decimal 0.2. To turn a decimal into a percentage, multiply the decimal by 100%. The answer is 20%.

3n + 4n - 2 = 61 7n - 2 = 61 7n = 63 n = 9 What was the first step used in solving this problem and why did they do that step?

The first step to solving the problem was combining like terms. They added 3n and 4n because they have the same variable, thus making them like terms. This step was done to simplify the problem into an easier two-step problem.