Solve using the addition principle and/or the multiplication principle.2r + 8 = 28
A. 6
B. 18
C. 22
D. 10
Answer: D
Mathematics
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A. 36x12y3 B. -12x8y3 C. 36x8y4 D. -36x8y3
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Write the number in standard form.The signal frequency was set to 
Hz.
A. 78,200,000 B. 782,000 C. 7,820,000 D. 469.2
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Solve the equation.3(x + 5) = 12
A. 9 B. -9 C. -1 D. 1
Mathematics
Solve.If a spring stretches 4 m when a mass of 7-kg is attached to it, how much will it stretch when a mass of 42-kg is attached to it?
A. 26 m B. 24 m C. 23 m D. 27 m
Mathematics