The answer is 20.679. Make sure to line up the decimal points before adding.
Answer is 5 x 5 x 5 = 125, so none of the shown answers is correct
When adding fractions that have the same denominator (the number on the bottom), you simply add the numerators together and keep the denominator the same. So 7/10 + 4/10 = (7+4)/10 = 11/10 which is the same as 1 1/10
15% is equivalent to 15/100 or 0.15. You find 15% of 40 by multiplying 40 x .15 = 6
Divide both sides of the equation by -2 to get the y variable by itself, this will yield the equation y = -4.
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When adding or subtracting equations with variables, you keep the variable as a unit. Think of the variable y as "apples", then the equation becomes 7 apples + 1 apple = 8 apples (or 8y)
