During a dry, spell the depth of a river decreased 3 inches every day for 7 days. write and evaluate an expression to represent this situation and write how many inches the depth decreased during this time

x=number of days the river decreased

3x=total number of inches river decreased

3(7)=total

21=total number of inches river decreased

robert puts 2 in each row

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