A substance has a half-life of 6 years. If 20 pounds are present initially, how much will remain after 2 years?

If z varies directly as x and z=30 when x=8 fine z when x=4

The sum of three numbers is 64. the second number is 3 more than the first. the third number is 11 less than twice the first. find the numbers

91284 the nearest ten thousand

Write 2n^4 without Exponents

Hello! I graduated in 2008 but forgot how to solve multiplication. It's been so long. However I want to be refreshed on solving 44•12

Can u guys answer these last 4 questions for me w / work shown and also label the ones u guys did so I won't get them mixed up 1.) yx divided by 2 use x=7 and y=2 2.) m-n divided by 4 use m=5 and n=8 3.) x-y+6 Use x=6 and y=1 4.

The consecutive angles of a parallelogram are congruent A) Always. B) Sometimes. C) Never

A student solved the following problem. t+7 = - 8 on Wow t=-15 t=-9 Which of the following statements is true? The solution is correct. o.

If a start time is 7:15 a. m and an end time is 8:05 a. m, why do you not have to count the hours to find the elapsed time?

Which ordered pair is a solution of the equation? -3x+4y=14 A - Only (2,5) B - Both (2,5) and (4,6) C-Neither