Use the distributive property to multiply. Then, if possible, simplify the resulting expression.4(a + b)
A. 4ab
B. 8ab
C. 4a + 4b
D. 4a + b
Answer: C
Mathematics
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Write the phrase as a mathematical expression. Use x as the variable.The difference of some number and 7.9
A. 7.9x B. x + 7.9 C. x - 7.9 D. 7.9
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Find the exact value of y, or state that y is undefined.y = cot-1 (1)
A. 
B. 
C. 
D. 
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Find the four second partial derivatives. Observe that the second mixed partials are equal.
?
?
A. 
B. 
C. 
D. 
E. 
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Find the vertex of the parabola associated with the quadratic equation.y = x2 + 2x + 8
A. (1, 8) B. (1, 7) C. (-1, 8) D. (-1, 7)
Mathematics