Find the sum.-5.3 + (-7.7)
A. 2.4
B. 13
C. -2.4
D. -13
Answer: D
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Solve the problem.Anita receives a promotional offer from a long-distance phone company of $0.03 per minute for long-distance calls. If she spends between $6 and $18 on long distance calls in the first month, the offer will be extended by an extra month. If she spends more than $18 in the first month, the offer will be extended by an additional two months. For what range of minutes must Anita use long distance in the first month, if the offer is to be extended by an extra month?
A. 
B. 
C. 
D. 
Provide an appropriate response.
Solve the system of equations using any method: 
x - 
y = 5x + 5y = -28
A. (-6, 2) B. (18, 6) C. (2, -6) D. (6, 18)
Solve the problem.A conservation officer needs to know the width of a river in order to set instruments correctly for a study of pollutants in the river. From point A, the conservation officer walks 105 feet downstream and sights point B on the opposite bank to determine that ? = 50° (see figure). How wide is the river (round to the nearest foot)? 
A. 163 ft B. 125 ft C. 80 ft D. 88 ft
Establish the identity.
= - sin(3?)
What will be an ideal response?