Every square matrix that does not contain a row of zeros is invertible

In ΔABC, ∠A is a right angle and m∠B = 60. If AB = 20 ft, find BC.

Which of the following equations are proportional? y = 3x+4, y=2x, y=4x+4, y=4x+2

Is 7/10 equivalent to 3/100, 1/5, or 4/100

Three postal workers can sort a stack of mail in 20 minutes, 25 minutes, and 100 minutes, respectively. Find how long it takes them to sort the mail if all three work together. The answer must be a whole number

If five cakes cost 5 pounds how much do 2 cakes cost

What is an expression equal to 5 (4x-3

The sales tax on a $350 computer is $22.75. Find the tax rate.

A train is traveling at 60 mph. If the rate of speed increases 4 mph each hour, how long will it be before the train is traveling at a rate of 80 mph? A. 4 hours B. 5 hours C. 6 hours D. 7 hours

A restaurant manager wants to purchase 200 sets of dishes. One design costs $10 per set, while another costs $35 per set. If she wants to use her entire budget of $4250 , how many of each design should be ordered

Is - 4,-20,-100,-500,-2500 arithmetic, geometric, or neither?