Solve.Mark the electrician charges $80 for a house call, and then $35 per hour for labor. Sara the electrician charges $65 for a house call, and then $45 per hour for labor. Graph the system to find the number of hours of electrical work that would be required for the two electricians to charge the same amount.
A. 1.5 hrs
B. 2 hrs
C. 1 hrs
D. 0.5 hrs
Answer: A
Mathematics
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Find the limit.
cos 
A. 0
B. -1
C. 
D. 1
Mathematics
Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 90% of the isotope left?
A. 527 yr B. 246 yr C. 1000 yr D. 500 yr
Mathematics
Find an equation for the graph.
A. y = 3 cos 2x
B. y = 3 cos 
x
C. y = 2 cos 3x
D. y = 2 cos 
x
Mathematics
Divide.-3.5 ÷ 0.07
A. -50
B. 
C. -34.3
D. -3.43
Mathematics