1. Pressure P (in pounds per square foot) on a diver at a depth of D feet. Solve for D: P=64d+2112
2. The selling price of a pair of pants is $34. If the store paid $8 less for the pants, find the price the store paid.
3. The sum of three numbers is 123. The second number is 9 less than two times the first number. The third number is 6 more than three times the first number. Find the three numbers.
1. P=64d+2112 ; solve for D. P=64d+2112 P - 2112 = 64d (P - 2112)/64 = d
2. The store is selling pants for $34, but they bought it for $8 less. 34 - 8 = 26 They paid $26 for the pair of pants.
3. x + y + z = 123 y = (2x) - 9 z = (3x) + 6 x + (2x - 9) + (3x + 6) = 123 6x - 3 = 123 6x = 126 x = 21 y = 2(21) - 9 y = 42 - 9 y = 33 z = 3(21) + 6 z = 63 + 6 z = 69 20 + 33 + 69 = 123 The three numbers are 21, 33, and 69.
