Add or subtract, if possible. Assume that all variables represent non-negative values and be sure to simplify your answer.-3
- a
- 7
+ 
A. -11
B. -2
- 9
C. -2
- 9a
D. -2
- a
- 7
Answer: D
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Provide an appropriate response.Suppose that A and B are both matrices of dimension r × s. Under what conditions can both the product AB and the product BA be found?
A. If r = s B. If r > 1 C. If r = 1 D. There are no conditions under which both products can be found.
Solve the problem.Sam and Chad are ticket-sellers at their class play. Sam is selling student tickets for $2.00 each, and Chad selling adult tickets for $5.50 each. If their total income for 24 tickets was $83.00, how many tickets did Sam sell?
A. 10 tickets B. 15 tickets C. 14 tickets D. 16 tickets
Solve the problem.The Family Fine Arts Center charges $20 per adult and $14 per senior citizen for its performances. On a recent weekend evening when 423 people paid admission, the total receipts were $6612. How many who paid were senior citizens?
A. 308 senior citizens B. 205 senior citizens C. 115 senior citizens D. 218 senior citizens
Determine if the following is an identity.cos2x - sin2x = 1 - 2 sin2x
A. Identity B. Not an identity