Which equations support the fact that rational numbers are closed under addition? Select each correct answer.

3√5+√5=4√5

√10 + (-√10) = 0

1/2 + 0.5=1

3√16 + 3√16=6√16

How do write an equation to represent a real world situation?

There are 10 councillors and 12 planning department staff available to serve on a committee to look into re - establishing two way traffic on the streets of St. Catharines.

Drop down 8x - 2 - 5x + 7 =

It takes 36 minutes less time to travel 120 miles by car at night than by day because the lack of traffic allows the average speed at night to be 10 miles per hour faster than the daytime. Find the average speed in the daytime.

A fair die is rolled 6 times. What is the probability that a 2 is obtained on at least one of the rolls?

Ramon earns $1,840 each month and pays $53.40 on electricity. To the nearest tenth of a percent, what percent of Ramon's earnings are spent on electricity each month?

The city of Hamden received money for improvements of the town's park. The park committee polled a random sample of 75 residents from the town. Of the 75 residents, 27 would like to see more trees planted in the park.

Intersecting lines forming linear pair which pair of angles is a linear pair?

A small publishing company is planning to publish a new book. The production cost to include a one-time fixed cost and variable cost. There are two production methods it could use.

What is the x-intercept of the equation 7x + 3y = 21?