Simplify completely.
7√10 - √6 + 2√10
Show all work please!

99 points create an expression equivalent to 3(4x -2) -5x + 10 using the least number of terms. (1 point for expression and 1 point for showing your work)

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?