Write 0.00000306 in scientific notation.

If 70 is decreased by 50%, what is the new amount

Brianna earns $5 each week for walking her neighbor's dog. How much money does Brianna earn in 7 weeks?

2/5 of a number is what percantage of that number

Herman has $18. He earns $8 for 1 hour (h) of tutoring. He wants to buy a skateboard for $90. Choose the inequality that shows the number of hours (h) Herman could tutor to be able to buy the skateboard.

A dance academy charges $28 per class and a registration fee of $20. A student paid a total of $1000 to the dance academy. Construct and solve an equation to find the number of classes the student took.

If a computer costs $600.00 and the sales tax rate is 7.5 percent, what is the total cost of the computer?

What is 2/3 cup chopped nuts multiplied by 6?

Who is taller 180 cm or 5ft 8in.

Samantha's notebook has 14 pages more than three times as much as Lisa's notebook. If Samantha's notebook has 260 pages, how many pages are there in Lisa's notebook?

What kind of bond pays interest which is exempt from tax?