Find the cofactor of the indicated element.a13
A. -10
B. 4
C. -8
D. -4
Answer: D
Mathematics
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Remove or add parentheses as indicated.Place parentheses to make the equation 
true.
A. (a + b) ? a + b = a2 + 2ab + b2 B. a + b ? (a + b) = a2 + 2ab + b2 C. (a + b) ? (a + b) = a2 + 2ab + b2 D. None needed.
Mathematics
Perform the indicated operations and simplify the result. Leave the answer in factored form.
? 
A. 
B. 
C. 
D. 
Mathematics
Use the quadratic formula to find any x-intercepts on the graph of the equation.2x2 = -8x - 5
A. 
B. 
C. 
D. 
Mathematics
Measure the lines using the ruler.
?
?
A. 26 mm B. 2 cm C. 20 mm D. 3 cm
Mathematics