Which algebraic expression is a polynomial? 3m2n – startfraction 2 m over n endfraction + startfraction 1 over n endfraction startfraction 2 m n over 5 endfraction – startfraction startroot m endroot over 4 endfraction + 4m5 startfraction 4 m cubed over n squared endfraction – 3mn5 + startroot 8 endroot 7mn + startfraction 3 m over 2 endfraction + startfraction 5 n over 4 endfraction

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2