Solve for the indicated variable.Solve r = 
for ?.
A. ? = 2Ar2
B. ? = 
C. ? = 
D. ? = 
Answer: C
Mathematics
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Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Mathematics
Solve for the amount of discount and amount due.Invoice amt: $642.39Invoice date: Sept 11Terms: 3/14 EOMGoods rec'd: Sept 14Date paid: Nov 12
A. Amount of discount: $18.97; amount due: $631.39 B. Amount of discount: $19.27; amount due: $623.12 C. Amount of discount: $0; amount due: $642.39 D. Amount of discount: $89.93; amount due: $552.46
Mathematics
Evaluate -(-x) for the given value of x.x = -70
A. - 
B. -70
C. 0
D. 70
Mathematics
Find the probability.When a single card is drawn from a well-shuffled 52-card deck, find the probability of getting a red card.
A. 2
B. 
C. 
D. 
Mathematics