A teacher had 21 red pens. if the ratio of red pens to blue pens she owned was 3:1 how many pens did she have total?

If a triangle ABC is classified as a right triangle, which statement is true? a. All three angles of triangle ABC are congruent. b. Two slopes of triangle ABC are opposite reciprocals. c. All three sides of triangle ABC are congruent. d.

Gwen has 3 red erasers, 4 green erasers, 2 black erasers, 5 purple erasers, and 6 yellow erasers in her book bag. What is the probability Gwen will reach in her book bag and select a purple eraser?

Rounds 9,820 to the thousand

What is 1,520,000,000 in scientific notation

Reggie, Alvin, and Jose are member of a relay running team. Reggie finished his leg of the race 2.45 seconds faster than Alvin and 3.81 seconds slower than Jose. If Reggie's time for his leg of the race was 57.12 seconds.

Given that Triangle ABC such that a=8cm, b=7cm and c=9cm tem and c = 9cm find Cos B

What is 12 times 4.8

How will adding the value 75 affect the mean and median of the data set 1, 5, 7, 9, 9, 10? A. The median increases and the mean stays the same. B. The mean increases and the median stays the same. C. The median increases less than the mean increases.

54,36,24 whats the next term in the geometric sequence

The price of a bike at Store A is 5656 the price xx (in dollars) at Store B. The price at Store A is $150.60$150.60. Write and solve an equation to find how much you save by buying the bike at Store A.