True or false?

If 3a > 9, then a > 27

If a scientist knows the relative age of a fossil, he can also know A. the type of climate from which it came. B. the relative age of the rock where it was found. C. how it became extinct. D. how long the organism was alive.

Let f (x) = x2 - 81. find f-1 (x).

Sylvia walked 1 1/2 miles so far this morning. If she plans to wake a total of 2 1/3 miles, how far does she have to go yet? A.) More than 1 mile but less then 1 1/2 B.) less then 1 mile but more than 1/2 mile C.) 1 Mile D.) Less than 1/ / mile

A public library wants to place 4 magazines and 9 books on each display shelf. The expression 4s+9s represents the total number of items that will be displayed on s shelves. Simplify the expression

a restaurant chain ordered 3940 pounds of rice in 20 pound bags. About how many 20 pound bag of rice did the chain order?

For each call, a certain phone company charges a connecting fee, and then a cost per minute after that. how much does each call's connecting fee cost?

Use a proportion to determine the number of children age 5 in a kindergarten class if 80% of a class of 20 children are that age. A. x=100 B. x=75 C. x=40 D. x=15 E. x=16

A $50 computer program is on sale for $37.50. What is the percent decrease? A. 10% B. 15% C. 20% D. 25%

The school auditorium has 34 rows of seats. The first row has 12 seats, the second row has 14 seats, and the third row has 16 seats. If this pattern continues, how many chairs will be in the last row?

5 ½ x 3= 2 ⅓ x 4 ¾= -2 ⅖ x 3 ¼=