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

A book sold 38,200 copies in its first month of release. Suppose this represents 9.8% of the number of copies sold to date. how many copies sold to date?

1. Which function has zeros at x = - 2 and x = 5? A.) f (x) = x^2 + 2x - 10 B.) f (x) = x^2 - 2x - 10 C.) f (x) = x^2 + 3x - 10 D.) f (x) = x^2 - 3x - 10

In a square, the sum of the lengths of three sides is 45 and in a rectangle the difference between a length and a width is 5 in. if a width of the rectangle is the same as a side of the square, how long is a length of the rectangle?

What is negative 1 and three fifths divided by negative two thirds equals?

What is the area of the following circle? Either enter an exact answer in terms of t or use 3.14 for it and enter your answer as a decimal. r=1

Anita opens a savings account by making a deposit of $272.95. Every week, she deposits another $45.25 in the account. How much will be in the account after 6 weeks?

Would you use more centimeters or meters to measure the length of a car? Explain.

The formula represents the surface area S of a cube with side lengths x. S=6x^2 Solve for x.

The cost of manufacturing x T-shirts is modeled by the function T (x) = 5x+12and the cost of manufacturing x sweatshirts is modeled by S (x) = 15x+18.

Laura wants to show 70 in tens. How many tens will she draw? How do you know?