Can someone explain this sum to me n = (12x21) / 7=12x3=36

Solve for x, y=3x^2 - x+1

Lena has some eggs. she uses 3/5of the eggs to make waffles and scrambled eggs. she uses 2/3 of the eggs she took to make waffles. What fraction of the total number of eggs does lena use to make waffles?

a close swimming pool is 15 ft wide and 31 ft long the club member want to exposed arrogant Border in a strip of uniform width around the pool they have enough material for 312 ft squared how wide can the strip be

Joyce paid $20.00 for an item at the store that was 75 percent off the original price. What was the original price? Give your answer to the nearest cent.

A study of the annual population of gray squirrels in a Texas state park shows the population, S (t), can be represented by the function S (t) = 273 (1.073) t, where the t represents the number of years since the study started.

Mr. Sonny's science class is calculating the average number of blinks per minute. Jan blinks 515 times in 5 minutes. What is her blinking rate, in blinks per minute?

An exterminator charges $80 to visit a home and $35 to spray each room. If the total bill was $395, how many rooms were sprayed? Write an algebraic equation that represents this situation. Then solve it.

What is the gcf of 28 and 70

What are the diameter and radius of a circle with a circumference of 32π ft? A. d = 16 ft r = 8 ft B. d = 32 ft r = 16 ft C. d = 16 ft r = 32 ft D. d = 8 ft r = 16 ft

Is 6/10 equal to 4/7