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 area of a rectangle is 72 square units. If its width is 4 units, find the length. A) 76 units B) 18 units C) 68 units D) 288 units

Compute the permutations and combinations. 10 C 10 choices. 10 1 0

Simplify the product by using FOIL (6x-5) (2x-3)

For a normal distribution curve with the mean of 15 and a standard deviation of 5, which range of the variable defines an area under the curve corresponding to a probability of approximately 68%?

You have a job as a salesperson for which you are paid $6 per hour plus $1.25 for each sale made. Your earnings for an 8 hour day are $88. Find the number of sales you made during the day

Two lines, parallel to the bases of a trapezoid divide each leg into three congruent parts and divide the trapezoid into three parts as well. Find the area of the middle part if the top and bottom parts have area S1 and S3.

Robin is making bows to sell at her mother's yard sale. She will use 3/4 foot of red ribbon and 2/3 foot of blue ribbon to make each bow. What is the ratio of the length of red ribbon to blue ribbon?

Explain why the polynomial 144x2 - 200x + 81 is not a perfect square. A. 81x ≠ 2 (20x ∙ 9) B. 144x ≠ 2 (20x ∙ 12) C. 200x ≠ 2 (9x ∙ 12) D200x ≠ 2 (12x ∙ 9)

Two factors of - 48 have a difference of 19. The factor with a greater absolute value is positive. What is the sum of the factors? a. - 19 b. - 13 c. 13 d. 16

1.) A population of 4,250 blue whale. A random sample of 10 whales shows that 5 of them are infected. How many whales are likely to be infected?