Translate the problem to a system of equations, then solve using Cramer's Rule.The sum of a student's three scores is 218. If the first is 22 points more than the second, and the sum of the first two is 14 more than twice the third, what was the first score?
A. 46
B. 68
C. 86
D. 64
Answer: C
Mathematics
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Determine whether the matrix is invertible by finding the determinant of the matrix.
A. Not invertible B. Invertible
Mathematics
Complete the operation and simplify if necessary.
?
?
A. 
B. 
C. 
D. 
E. 
Mathematics
Find the limit, if it exists.
(2x5 - 2x4 + 4x3 + x2 - 5)
A. 31 B. -1 C. 127 D. 63
Mathematics
Solve.In chemistry, the pH of a substance is defined by 
where 
is the hydrogen ion concentration in moles per liter. Find the 
of a sample of lake water whose 
is 
moles per liter. (Round to the nearest tenth.)
A. 6.4 B. 7.3 C. 10.1 D. 8.5
Mathematics