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

The square root of 5x+6=x (solve)

Jenny can type at a speed of 80 words per minute. It took her 20 minutes to type a report. How many times words was the report?

A group of dancers raised some money for a charity here is some information about the money raised One of the dancers is chosen at random to give the money raised to the charity What is the probability that this dancer raised less then £10

A canoe travels 3 3/4 kilometers in 3/5 of an hour. What is the average speed of the canoe, in kilometers per hour. A) 4/9 B) 2 1/4 C) 5 5/12 D) 6 1/4

At Kim's birthday party, there were 42 guests. If each guests ate 1/6 of a cake (and there was no cake leftover), how many cakes were there?

What are the advantages and disadvantages of using cumulative frequency?

20 min to drive between two roads at average speed 45 mph how far apart is the town

What is 2+2 i need to know

A track and field playing area is in the shape of a rectangle with semicircles at each end. The perimeter of the track is to be 1200 meters.

Nicole has a stack of 50 dishes to wash. It took her 2 minutes to wash 8 dishes. At this rate, how long will it take Nicole to wash all 50 dishes?