Translate the problem to a system of equations, then solve using matrices.Walt made an extra $10,000 last year from a part-time job. He invested part of the money at 10% and the rest at 8%. He made a total of $920 in interest. How much was invested at 8%?
A. $8000
B. $6000
C. $5000
D. $4000
Answer: D
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Solve the problem.A $156,000 trust is to be invested in bonds paying 7%, CDs paying 5%, and mortgages paying 9%. The sum of the bond and CD investment must equal the mortgage investment. To earn an $11,580 annual income from the investments, how much should the bank invest in bonds?
A. $31,000 B. $78,000 C. $45,000 D. $33,000
Find the distance between the pair of points on the number line.
, 
A. 
B. 
C. 
D. 
Find the products AB and BA to determine whether B is the multiplicative inverse of A.A = 
,B = 
A. B ? A-1 B. B = A-1
For a regular square pyramid, each side of the base is 6 inches long. If the altitude of the pyramid measures 9 inches, find the length of each lateral edge correct to the nearest tenth of an inch.
What will be an ideal response?