After simplifying, which expressions are equivalent? check all that apply.

(3.4a – 1.7b) + (2.5a – 3.9b)

(2.5a + 1.6b) + (3.4a + 4b)

(–3.9b + a) + (–1.7b + 4.9a)

–0.4b + (6b – 5.9a)

5.9a – 5.6b

Expression 1, 3 and 5 are equivalent.

Step-by-step explanation:

After simplifying each expression we get,

1.

Combine like term.

Similarly,

2.

3.

4.

5.

Therefore expression 1, 3 and 5 are equivalent.

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

this answer is !