21 Which inequality represents the following statement?
"A number increased by 4 is at most 15."

x + 4 ⩽ 15

Step-by-step explanation:

Let

The number = x

At least in inequality is ⩾ (greater than or equal to sign)

At most in inequality is ⩽ ( less than or equal to sign)

A number increased by 4 is at most 15.

x + 4 ⩽ 15

The inequality that represent the statement is x + 4 ⩽ 15

x + 4 ⩽ 15

x ⩽ 15 - 4

x ⩽ 11

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