Solve the system of equations using Gaussian elimination or Gauss-Jordan elimination.x - y + z = 2x + y + z = -4x + y - z = 0
A. (-2, 1, -3)
B. (1, -2, -3)
C. (1, -3, -2)
D. No solution
Answer: C
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Solve the problem.Roberto invested some money at 6%, and then invested $3000 more than twice this amount at 10%. His total annual income from the two investments was $3160. How much was invested at 10%?
A. $2500 B. $22,000 C. $25,000 D. $9000
This double-bar graph shows the number of male (M) and female (F) athletes at a university over a four-year period. Answer the question.
What percentage of all students involved in athletics in Year 1 was female? (Round to the nearest percent.)
A. 14% B. 43% C. 75% D. 57%
Provide an appropriate response.Find the number of compounding periods that correspond to a term of 7
years if the account is compounded: a. quarterly b. weekly c. monthly
A. a. 30, b. 364, c. 84 B. a. 30, b. 390, c. 90 C. a. 22.5, b. 390, c. 84 D. a. 28, b. 390, c. 90
Solve.A box is made from a rectangular piece of metal with length 10 inches and width 6 inches. The box has no top. 
Find a polynomial that gives the volume of the box for a given x.
A. 4x3 - 32x2 + 60x B. 4x3 + 32x2 + 60x C. 4x2 - 32x + 60 D. 60x