How do you round and estimate a number

What is the positive solution of x^2 - 36 = 5x

5 square root of x^16

Brooke collects porcelain dolls and teddy bears. Over the years, the number of porcelain dolls she collected is 14 less than twice the number of teddy bears. If she has a total of 52 dolls and bears, how many teddy bears does Brooke have?

How many times larger is 12 x 104 than 4 x 102?

600 coins and 240 are pennies. What percentage are pennies?

Amanda uses the recipe shown to make punch for a family party: 7 parts mixed fruit 2 parts lemonade How much lemonade will she need to make 180 fluid ounces of punch? a. 140 fluid ounces b. 40 fluid ounces c. 36 fluid ounces d. 60 fluid ounces

Are 8x and 2x to the second power like terms?

Bob's bill for dinner at a restaurant is $37.80. If he wants to leave a 15% tip, which best represents a reasonable amount for the tip?

What are factor pairs of 250

Factor completely 36x2 - 25. Select one: a. (6x - 5) (x + 5) b. (6x + 5) (6x + 5) c. (6x - 5) (6x - 5) d. (6x + 5) (6x - 5)