Write the English phrase as an algebraic expression. Let the variable x represent the number.Twice a number, increased by 79
A. 2x - 79
B. 2x + 79
C. 2(x + 79)
D. x + 79
Answer: B
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Solve the problem.Suppose a necklace is made from 18-karat gold and weighs 54 grams. Find the weight, in grams, of the pure gold in the necklace.
A. 40.5 grams B. 18 grams C. 54 grams D. 6 grams
Determine the inequality which matches the calculator graph. Do not use your calculator. Instead, use your knowledge of the concepts involved in graphing inequalities.
A. y ? -3x + 1 B. y ? 3x + 1 C. y ? 3x + 1 D. y ? -3x + 1
Solve the problem.A carousel has a radius of 19 feet and takes 30 seconds to make one complete revolution. What is the linear speed of the carousel at its outside edge? If necessary, round the answer to two decimal places.
A. 119.38 ft/sec B. 3.98 ft/sec C. 9.92 ft/sec D. 0.63 ft/sec
Solve.If y varies directly as the square root of x, and y = 8 when x = 1, find y when x = 100.
A. 80
B. 800
C. 
D. 