This is more a math question but no one is answering in the "math" section.

Compute 6.28x10^13 + 6.30x10^11. Express your answer to three significant figures.

What is 5,634 divided by 18

A fundraiser is being held to raise money for a new school playground. Of every $20 raised,$16 will be spent on playground equipment. If the goal of the fundraiser is $320 for playground equipment, how much total money will it need to raise?

Ricardo has read 2/3 of a book. Lin had read 2/4 of the same book. Who read more of the book?

Five added to a number gives the sum of 39. what is the unknown number?

For babysitting, nicole charges a flat fee of $3, plus $5 per hour. how much money will she make if she baby-sits 5 hours?

Manuel buys 7.9 pounds of strawberries. Each pound costs $3.89. Which expression gives the best estimate of the cost of the strawberries? (8) ($4) (7) ($4) (8) ($3) (7) ($3)

Maria is buying new carpet for her bedroom. Her bedroom is in the shape of a square and the length of each side is 12 feet. Write and simplify an exponential expression to find how much carpet she needs.

Write 19/20 as a decimal without using long division

Which fraction is bigger 11/15, 14/27

Explain the relationship between a strategy, such as number sense, and a written method such as partial products or area models, for multiplying decimal numbers.