Multiply mentally.70 ? 90
A. 160
B. 6300
C. 6390
D. 6210
Answer: B
Mathematics
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Use implicit differentiation to find dy/dx.2xy - y2 = 1
A. 
B. 
C. 
D. 
Mathematics
Solve the application.On average, 
of a teenager's day is spent at school or sleeping. If
is spent sleeping, what fraction is spent in school?
A. 
of their day
B. 
of their day
C. 
of their day
D. 
of their day
Mathematics
Simplify the expression.4[-5 + 3(-5 + 7)]
A. 4 B. -14 C. -16 D. -20
Mathematics
Determine if the sequence is geometric. If the sequence is geometric, find the common ratio.-7, -11, -15, -19, . . .
A. yes, -12 B. no C. yes, 4 D. yes, -4
Mathematics