Factor completely. State that the polynomial is prime if it cannot be factored.81x2 - 4
A. prime
B. (9x + 2)2
C. (9x + 2)(9x - 2)
D. (9x - 2)2
Answer: C
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Solve.x2 - 10x + 25 = 36
A. 41 B. 11, -1 C. 6, -6 D. -1, -11
Use the REGRESSION feature on a graphing calculator.A strain of E-coli Beu-recA441 is placed into a petri dish at 30?Celsius and allowed to grow. The following data are collected. Theory states that the number of bacteria in the petri dish will initially grow according to the law of uninhibited growth. The population is measured using an optical device in which the amount of light that passes through the petri dish is measured. 
Find the exponential equation in the form y = a ? bx, where x is the hours of growth. Round to four decimal places.
A. y = 1.3384 ? 0.0903x B. y = 0.0903x C. y = 0.0903 ? 1.3384x D. y = 1.3384x
Solve the problem.Two cars leave a city and head in the same direction. After 5 hours, the faster car is 40 miles ahead of the slower car. The slower car has traveled 240 miles. Find the speeds of the two cars.
A. 40 mph and 48 mph B. 50 mph and 58 mph C. 48 mph and 56 mph D. 80 mph and 88 mph
Solve. Remember to insert units when writing your answer.In November, 9 tons 1385 lb of coal were delivered to a steel mill. In December, 5 tons 1578 lb were delivered. Find the total amount of coal delivered in these two months.
A. 3 tons 1807 lb B. 14 tons 963 lb C. 15 tons 963 lb D. 4 tons 1807 lb