Which equations are balanced? Select four options.

-Mg3N2 + H2O → 3MgO + 2NH3

-C3H8 + 5O2 → 4H2O + 3CO2

-Zn + 2HCl → ZnCl2 + H2

-3Ca (OH) 2 + 2H3PO4 → Ca3 (PO4) 2 + 6H2O

-3H2SO4 + 2Fe → Fe2 (SO4) 3 + H2

-4Al + 3O2 → 2Al2O3

There are 200 students in the seventh grade. The ratio of girls to boys is 5 to 3. What percent of the students are boys? A:67% B:62.5% C:37.5% D:40%

Write 26% as a fraction in simplest form.

Triangle XYZ slides 2 units left and 1 unit down on the coordinate plane. If the original measure of angle X was 40 degrees, what is the measure of angle X'?

Ahmad rented a movie. He started the movie at 6:48 pm, and it was 4 hurs 27 minutes long. When did the movie end?

The starting distance, at 0 hours, is 300 miles. At 2 hours, the traveler is 725 miles from home. At 2.5 hours, the traveler is 875 miles from home. At 3 hours, the distance is constant, at 880 miles.

Rename 13 4/12 as a mixed number with a fraction greater than 1

12x=48-8y - 10x=38-8y X=5 what is y

What is the domain of f (x) = cos (x) ? the set of real numbers - 2x3x32x the set of real numbers - 1 5x51 the set of real numbers 0 SXS2 the set of all real numbers

Tyler had 2 7/16 yards of fabric. He used 3/4 yard to make a vest about how much fabric did he have left?

Rosario paid $2.50 for 3 pounds of apples. Select all of the rates that are equivalent to the rate Rosario paid. A.$0.90 for 1 pounds B.$4.50 for 5 pounds C.$7.50 for 9 pounds D.$9.60 for 11 pounds E.$10.00 for 12 pounds