What's 66 rounded to the nearest ten

Anyone good at math? Geometry in particular?

How many 1 3/5 inch-books can fit on a 14 1/2 inch-long bookshelf

F (n) = n - 4; Find f (2)

The measure of one side of a square (s+3) inches long. which pair of expressions both represent the perimeter of this square?

Joshua walked on a treadmill for 1/3 of an hour. How many seconds is this? A) 20 B) 120 C) 1,200 D) 3,600

A necklace is valued at £1200 It's value is expected to increase by 4.5% per year over the next 3 years. Calculate the expected value of the necklace after this time

Natalie drives 2.4 miles round trip each time she goes to the grocery store. Which expression can Natalie use to determine the number of miles she drives in 8 round trips to the grocery store?

Josiah conducts an experiment that has 4 possible outcomes. Sally conducts an experiment that has 10 possible outcomes. The students conduct 50 trials each. Which statement best compares the two experiments?

Can - 20 and 20 be expressed with a less than or equal to sign? Example: - 20 _< 20.

Train travels 60 miles in 40 minutes what is the average speed