60 l of 72% alcohol and 70 l of 90% alcohol are mixed. How many liters of water should be added so that the mixture contains 60% alcohol.

Choose the number sentence that shows the identity property of addition. a. 122 = 61 + 61 b. 62 = 1 + 61 c. 61 = 0 + 61

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

Solve 2x − 1 = 11 for x using the change of base formula log base b of y equals log y over log b.