What is the least common denominator for 7 and 3

A teacher has two students, one two times as old as the other. The teacher is five times as old as the older student, and in 5 years she will be five times as old as her younger student. Find the teacher's present age.

M+45=32 solve the equation

The hypotenuse of a 45 degree negative 45 degrees - 90 degree triangle measures 4 cm what is the length of one leg of the triangle

When a number is decreased by 30%of itself, the result is 126. what is the number?

Change 84% to a fraction

18, - 82, - 182, - 282,

To calculate 31^2, Emily mentally figures the value 30^2 and adds 61. Emily subtracts a number from 30^2 to calculate 29^2. What number does she subtract?

Christopher wrote the number pattern below. The first term is 8. 8,6,9,7,10 ... What is a rule for the pattern?

A stack of 12 pennies is 18.24 millimeters high how thick is each penny how thick would a stack of 20 pennies be?

Which statement is true about the sum of (5y/y^2) + (y-4/5y) ? A: The denominator of the simplified sum is y2 + 5y. B: The denominator of the simplified sum is 5y. C: The numerator of the simplified sum is 5y2 - 4.