Solve the problem.Assume it costs 25 cents to mail a letter weighing one ounce or less, and then 20 cents for each additional ounce or fraction of an ounce. Let L(x) be the cost of mailing a letter weighing x ounces. Graph y = L(x). Find the intervals on which L(x) is continuous.
A. 
L(x) is continuous on the intervals [0, 1), [1, 2), [2, 3), . . .
B. 
L(x) is continuous on the intervals [0, 1), [1, 2), [2, 3), . . .
C. 
L(x) is continuous on the intervals (0, 1], (1, 2], (2, 3], . . .
D. 
L(x) is continuous on the intervals (0, 1], (1, 2], (2, 3], . . .
Answer: C
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Solve the problem.A ramp L ft long has an incline of ?. The work W needed to move an object weighing P lb up the ramp is given by W = PL(sin ?). To the nearest unit, find the work needed to move a trunk when: 
A. 792 ft-lb B. 959 ft-lb C. 871 ft-lb D. 3840 ft-lb
Graph the function on a grapher. Then use the grapher to find the x- and y-intercepts. Round to the nearest hundredth if necessary.f(x) = 0.68x2 + 1.57x + 15.76
A. No x-intercepts, (0, 15.76) B. (15.76, 0), no y-intercepts C. (3.80, 0), (-6.11, 0), (0, 15.76) D. (3.80, 0), (0, 15.76)
Provide an appropriate response.(a)Sketch the graph of y = 2x + 1. (b) Determine the intercepts.(c)Based on your graph, is y a function of x? If so, state(d)the domain and (e) the range.
What will be an ideal response?
Solve the problem.How can $42,000 be invested, part at 4% annual interest and the remainder at 10% annual interest, so that the interest earned by the two accounts is equal at the end of the year?
A. $30,000 invested at 4%; $12,000 invested at 10% B. $22,000 invested at 4%; $20,000 invested at 10% C. $12,000 invested at 4%; $30,000 invested at 10% D. $20,000 invested at 4%; $22,000 invested at 10%