What is the sign of a^14 × b^53 × 3/8?

What is the value of the expression below? (81^2)^1/8

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?