Solve.A particular substance decays in such a way that it loses half its weight each day. How much of the substance is left after 8 days if it starts out at 64 grams?
A. 
gram
B. 
gram
C. 4 grams
D. 2 grams
Answer: B
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Solve the equation 
. Restrict your attention to the horizontal span of 0 to 5. Round your answer to two decimal places if necessary.
?
A. 1.41 B. 2.73 C. 0.19 D. 4.46
The size of two matrices is given. Find the size of the product AB and the product BA, if the products exist.A is 2 × 1, B is 1 × 1.
A. AB is 2 × 1, BA is undefined. B. AB is 1 × 2, BA is 1 × 1. C. AB is undefined, BA is 1 × 2. D. AB is 2 × 2, BA is 1 × 1.
Perform the indicated operations and simplify the result. Leave the answer in factored form.
- 
A. 
B. 
C. 0
D. 
Find the fifth term and the nth term of the geometric sequence whose initial term, a, and common ratio, r, are given.a = -7; r = -3
A. a5 = 189; an = -7 ? (-3)n B. a5 = 189; an = -7 ? (-3)n-1 C. a5 = -567; an = -7 ? (-3)n-1 D. a5 = -567; an = -7 ? (-3)n