Solve the equation.
= 
+ 
A. {4}
B. 
C. 
D. 
Answer: C
Mathematics
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The sizes of two matrices are given. Find the size of the product AB and the size of the product BA, if the given product can be calculated.A is 1 × 3; B is 3 × 1.
A. AB is 1 × 1; BA cannot be calculated. B. AB is 1 × 1; BA is 3 × 3. C. AB is 3 × 3; BA is 1 × 1. D. AB cannot be calculated; BA is 3 × 3.
Mathematics
Solve the problem.Mike buys a bike for $2800. In the first month after he buys it, it depreciates by 13%. What is the value of the bike after 1 month?
A. $364 B. $2787 C. $3164 D. $2436
Mathematics
Evaluate.
, when x = 10 and y = 30
A. 3 B. 6 C. 4 D. 5
Mathematics
Solve the system of linear equations by the method of elimination, find (x,y).
?
?
?
A. No solution B. ?(20 + 9a, a) (infinitely many solutions) C. (-3, -7) D. (38, 2) E. (-7, -3)
Mathematics