Translate the problem to a system of equations, then solve using matrices.A merchant has coffee worth $30 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $30 coffee should be used?
A. 250 lb
B. 300 lb
C. 125 lb
D. 150 lb
Answer: A
Mathematics
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Solve the problem.The following Venn diagram describes the desserts people ordered at a party. Use it to determine how many people ordered ice cream but not cake.
A. 21 B. 15 C. 36 D. 7
Mathematics
Write the first four elements of the sequence.
A. 
, 
, 
, 
B. 0, 
, 
, 
C. -1, 1, 
, 
D. 1, 
, 
, 
Mathematics
Prove the formula for all natural numbers n.
?
?
List the steps involved.
What will be an ideal response?
Mathematics
Solve the equation.-40 = 5k
A. k = -45 B. k = 45 C. k = 1 D. k = -8
Mathematics