Expenses that are bi-weekly are paid

A) every two weeks

B) twice a week

C) every two months

D) twice a month

How do I solve 2x-3y=-1 and y=x-1 with substitution?

Each morning papa noted the birds feeding on his birdfedder. So far this month he had seen 59 blue jays, 68 black crows, 12 red robins and 1 cardinal. If 300 birds visits papas birdfeeder, how many bluejays can we expect to see. 177 126 140 75

75% of b is 12. What is b?

Problem: The altitude of an airplane descending to an airport is represented by the equation shown below, where y represents the altitude, in feet, of the airplane and x represents the number of minutes since landing began.

Monique created the two-way table below to show her classmates' favorite carnival rides. Favorite Carnival Rides Ferris Wheel Super Slide Total Boys 23 35 Girls 14 42 Total 37 How many boys prefer the Ferris wheel? 12 28 40 58

A password can be any string of length 7, 8, or 9. Each character in the password can be any capital letter or special character from the set {*, $, &, #, %}. There are no other restrictions on the password.

It is 1:50PM. What is the sum of the degrees the minute and hour hands of a clock will rotate between now and when it hits 2:15PM?

What does the ratio 2:1 mean?

Estimate the difference by rounding off to nearest tens. 6723 - 751

Who invented the square root of negative one?