In a race the mean time for three runners is 12.4 seconds and the mean time for another six runners was 11.5 seconds. Calculate the mean time for all nine runners.

The water level at lake penny changed - 1 1/10 in this year. Its predicted to change another - 1 2/5 the second year. Whats the total change that will accur in 2 years

A carpenter is framing an opening in a wall to hang a rectangular door. Which properties must the door frame have to ensure that the door hangs properly? Check all that apply.

The first term of an AP is 5, common difference is 3 and the last term is 80. Find the number of terms.

What side lengths do the area models of 45 and 60 have in common?

Your teacher has the same hat with numbers 1,2,3,4,5,6,7,8,9,10,11 and 12 in it. She wants you to take two turns drawing a number. After the first time you draw, you will put the number back in the hat before drawing again.

Wjat is 5*5:2+34. Need the answer

The sum of three consecutive odd integers is equal to 15 more than twice the middle integer what are the three integers

How long will it take to earn $252 in interest if $1200 is invested at a 7% annual interest rate?

298, 209, 129, 58, - 4 continue the sequence

After careful testing and analysis, an oil company is considering drilling in two different sites. It is estimated that site A will net $30 million if successful (probability. 4 ) and lose $4 million if not (probability.