80 95 90 80 100 _ what goes on the blank to get a mean of 90

If you don't use algebra in real life why teach it

What is the sum and classification of 3/20 + √10 (sqrt of 10) ? 1) 3.31227766 ..., irrational 2) 3.31227766 ..., rational 3) 18.16227766 ..., irrational 4) 18.16227766 ..., rational (not a multiple choice)

Are parabolas symmetric

5/2*x=1 solve mentally

If two opposite sides of a square are increased by 14 meters and the other sides are decreased by 7 meters, the area of the rectangle that is formed is 72 square meters. find the area of the original square.

Harriet plans to file using Single federal income tax return with her husband. Together, they made $145,000 last year. They also received $500 in interest from a CD they own together. They have no children.

Two identical rubber balls are dropped from different heights. Ball 1 is dropped from a height of 148 ft, and ball 2 is dropped from a height of 203 feet.

If 4+6+7=242854 6+6+7=364217 6+7+8=424828then 7+5+8=?

the numbers 30 to 74 are in a hat. If the probability of drawing a multiple of 2 is 23/45. What is the probability of not drawing a multiple of two?

What is the value of p? p+1/5-1/2=1/10