Use a half-angle formula to find the exact value of the expression.cos
A. 
B. 
C. 
D. 
Answer: C
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Solve for x and y: 2x + y = 4; x - 2y = 2
a. x = 2 y = 0 b. x = 0 y = -2 c. x = 0 y = 2 d. x = -2 y = 0 e. x = 2 y = 2
Answer the question.Consider the numbers 2, 
, -19, 0, 
, 
, 0.
, 0.23 Which are rational numbers?
A. 2, -19, 0, 
, 
, 0.23
B. 
, 0.
, 0.23
C. 2, -19, 0, 
, 
, 0.
, 0.23
D. 2, -19, 0, 
, 0.
, 0.23
Use the check register find the ending balance.Elizabeth Shu had a balance of src="https://sciemce.com/media/4/ppg__10619192215__f1q1g6.jpg" alt="" style="vertical-align: -4.0px;" /> check deposit, and wrote check 
in her checking account before writing two checks and making a deposit. On 
she wrote check 
to ABC Garage for 
Then on 
she made a 
to The Food Store for 
Record the checks and deposit in Elizabeth's check register, and then find the ending balance.
A. $3372.38
B. $2562.53
C. $2197.48
D. $2462.28
Simplify. Include the absolute value symbol if necessary. If the answer is not a real number, state so.
A. 
B. 
C. 
D. 