One Step Equations and Inequalities

0.7 + x = 1.5

0.7 + x = 1.5

x - 12 = 2

z + 45 = 92

3c = 12

10x = 90

Solve for x.

After 4 students joined a class, the class has 32 students. Which equation can be used to find n, the number of students in the class before the new 4 students joined?

• $\frac{n}{4}\ =\ 32$

• n - 4 = 32

• 4n = 32

• n + 4 = 32

Ted bought a dolphin poster for $12. He now has $5. Write and solve an equation to find out how much money Ted took to the aquarium.

• m - 12 = 5

• m - 5 = 12

• m + 5 = 12

• m + 12 = 5