What is the lcd for? 11/21 and 31/45

Erin is 3 years younger than twice Alex's age. Their ages combined are 33 years. How old are Alex and Erin. If x=Erin's age and y=Alex's age; choose the system that matches the situation.

How do I write 2•r•r•t•t as exponents?

The sum of eight and three times a number is 53. Find the number. Part one - write an equation Part two - Solve it

How do you multiply -.03 x 233%

What is the reciprocal of 60

In a computer game, a bird flies at a height of 1,281 feet. At the same time, a fish swims 282 feet below sea level. What is the difference between the height of the bird and the depth of the fish?

3√464 Step 1: 3 (√400 + √64) Step 2: 3 (20 + 8) Step 3: 3 (28) Step 4: 84 One of the steps shown is incorrect. Rewrite the incorrect step so that it is correct and find the correct answer. Write the answer in radical form, no decimals.

Two sides of an obtuse triangle measure 12 inches and 14 inches. The longest side measures 14 inches. What is the greatest possible whole-number length of the unknown side?

4z to the second power = 144

Lyle has 7/10 as many stamps as jeremy. If Jeremy has 140 stamps. How many more stamps does he have than lyle?