Use the rules for exponents to rewrite the expression and then evaluate the new expression. 
A. 0
B. -12
C. 1
D. -4
Answer: C
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Use the total differential dz to approximate the change in z as (x, y) moves from P to Q. Then use a calculator to find the corresponding exact change ?z (to the accuracy of your calculator).4x3y2; P(1, 1), Q(1.01, 0.99)
A. dz = 0.04; ?z = 0.0381920404 B. dz = 0.04; ?z = 0.0391920404 C. dz = 0.03; ?z = 0.0391920404 D. dz = 0.04; ?z = 0.0416920404
Add or subtract. Simplify all answers. Express as a mixed number.12
- 
A. 11
B. 12
C. 10
D. 11
Use the check register find the ending balance.Mary Dunn had a balance of src="https://sciemce.com/media/4/ppg__10624191611__f1q26g6.jpg" alt="" style="vertical-align: -4.0px;" /> Then on 
in her checking account before writing three checks and making two deposits. On 
she wrote check 
to Dr. Crandal for 
and check 
to Express Framing for 
she made a 
deposit, and wrote check 
to Big Electronics for 
On 
she made a 
check deposit. Record the checks and deposits in Mary's check register, and then find the ending balance.
A. $4330.70
B. $3210.04
C. $3054.69
D. $3655.61
Solve the system by the elimination method.4x + 5y = 1512x + 15y = 45
A. ? B. {(6, 1)} C. {(x, y)| 4x + 5y = 15} D. {(0, 4)}