At a school costume party, seven girls wore masks nine
boys did not. if there were 15 boys at the party & 20 students
did not wear masks. what was the total number of students
at the party?

The triangles are similar. what is the value of x? show your work.

Use properties to rewrite the given equation. which equations have the same solution as 2.3p – 10.1 = 6.5p – 4 – 0.01p?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.