13+23+12+7 name the property used in each step

What happens if you fail just one elective in 7th grade?

How many liters of pure acid must be added to 3 liters of 50% acid solution to obtain a 75% acid solution?

The longest side of a right triangle is 15 feet. The third side is 15 less than three times the shortest side. Find the length of the shortest side.

17. The 5th term in a geometric sequence is 140. The 7th term is 35. What are the possible values of the 6th term of the sequence?

A hot air balloon leaves the ground and rises to an elevation of 1,100 feet. During the next 30 minutes, it descends 500 feet, rises 950 feet, descends 375 feet, and finally passes over a school.

A printer takes 5mins to print 90 copies of a repor. At this rate, how many copies of the same report can it print in 1/2 hours

What are the coordinates of the vertex of the graph of the function y=-x^2+6x-11 the options are: (3,-2) (3,16) (-3,-29) (-3,-20)

The annual amount A (in billions of dollars) Americans spent on meals and beverages purchased for the home for the years since 2000 can be modeled by A (C) - 286 + 880 where t represents the year, with t = 3 corresponding to 2003.

Carol is sixty-six inches tall. This is twenty inches less than two times Mindy's height. How tall in Mindy?

Assume running consumes 108 calories per mile. If you run 11 - minute mile what is your average power output, in watts, during a 2-hour run?