Which property of equality justifies the statement if x - 2 = 9, then x = 11

Raul is 5 years older than twice carlos age. the sum of their ages is 101. how old is carlos?

The solutions to the equation =2x^2+x-1=2are * = - 3/2 or x=

W (K) = k^3+8k^2, find w (-3)

There is a pattern that repeats a square and a triangle. If each side of each polygon is 1 inch, how many polygons will there be to make the total of the perimeter 35 inches?

How many fractions are equalavent to 4/5.

What is x? - 4x-6=-10x

While in europe, if you drive 105 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 30.0 mi/gal? assume that 1euro=1.26dollar?

Make a scale drawing of a rectangle school hall which is 50m long and 30m wide using a scale of 1cm to 5m. use your scale drawing to find the actual distance between opposite corners of the hall.

Is 6/7 a whole or a natural number? can fractions be natural numbers?

2 doctors is what percent of 25 doctors?