The mean life of a tire is 30,000 km. The standard deviation is 2000 km. 95% of all tires will have a life between___ km and ___km.

Marta made 4 stacks of wooden blocks. The first stack was 4 blocks tall. The second stack was 7 blocks taller than the first. The third stack was 2 blocks shorter than the second stack, and the last stack was 7 blocks taller than the third stack.

The width of a rectangle is 1.9 feet. The perimeter is 7.4feet. What is the length?

solve the equation using mental math a + 1/3 = 6/7 A) 1 3/21 B) 5/10 C) 7/10 D) 11/21

Bethany says that 3x+6+x and 3 (x+2) and equivalent expressions. She used substitution to support her answer. Explain what Bethany did wrong

Find (4x10^5) - (9x10^2)

A mixture of dimes and quarters has a total value of $10.20. There are 57 coins in all. How many type of each coin is present?

Amy went to soccer practice at 10:30 a. m. She returned home at 1:25 p. m. How long was Amy at soccer practice,

What is the circumference of a circle if the radius is 13?

You receive 9 text messages in 12 minutes. What is the rate of text messages per hour?

How does 20/50 compare to 50 percent Jenny claims 20/50 is equivalent to 70/100 because if I add 50 to the denominator to get to 100 and the add the 50 to the numerator to get 70 the faction becomes 70/100" explains why 20/50 &