Combine like terms 3x + 5y - x A. 7xy
B. x + 5y
C. 2x + 5y
D. 2x - 5y
plz help me

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In exponential growth functions, the base of the exponent must be greater than 1,how would the function change if the base of the exponent were 1? how would the fiction change if the base of the exponent were between 0and 1

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.