Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 80.

What is the answer to v=x•y•z

the temperature was - 3 degrees last night. it is now - 4 degrees. what was the change in the temperature

Bryan is buying notebooks and pens at an office supply store. Notebooks cost $3.59 and pens cost $1.49. He can spend up to $13 on these items. He bought 2 notebooks. What is the maximum amount of pens he could buy?

Who or what started world war 2

Solve for x, 2x2 + x - 3 = 0

Justin wants to plant grass in his backyard. His backyard is in the shape of a rectangle. Its length is 32 feet and its width is 21 feet. Suppose each pack of seed covers 12 square feet. How many packs of seed will he need to cover the backyard?

Write a number that completes the analogy: x to the power of 2 is to 121, as x to the power of 3 is to?

John has twice as many dimes as nickels. All together he has $2.75. How many dimes do he have?

Explain how to write a function rule from the table below. Then write a function rule X|2|4|6 Y|1|0|-1

A man went into a bank to cash a check. In handing over the money the cashier, by mistake, gave him dollars for cents and cents for dollars. He pocketed the money without examining it, and spent a nickel on his way home.