Equations
Solve: 2x + 5 = 11
x = 3
Solve: x+7>10
x > 3
−6+9=
3
What is 25% of 60?
15
Two is to three as x is to twelve. What is x?
8
Solve: 4(x−2)=20
x = 7
Solve: 2y−3 ≤ 5
y ≤ 4
−12−8=
-20
80 is 40% of what number?
Think: 80 = 40% * #
200
The scale on a map is 1 inch = 12 miles. How many miles is 4.5 inches?
54 miles
The sum of twice a number and 8 is 20. Write and solve the equation.
2x + 8 = 20
x = 6
A store requires you to spend at least $50 for free shipping. Write an inequality for 's', the amount you spend.
s ≥ 50
-10 - -9 =
-1
Increase 50 by 20%.
Think: A $50 shirt went up by 20% after tax+shipping.
60
3 notebooks cost $7.50. How much will 5 notebooks cost?
Solve: (3/4)x − 5 = 7
x = 16
Solve: −3x > 12
x < -4
(-24)/6 =
-4
A $120 item is on sale for 25% off. What’s the sale price?
$90
A recipe calls for 4 cups of flour to make 24 cookies. How many cups of flour are needed for 60 cookies?
10 cups
Solve: 5x−3 = 2x+12
x = 5
Solve: 4x−7 ≤ 3x+2
x ≤ 9
(-4)3 =
-64
The price of a phone increased from $500 to $550. Find the percent increase.
10%
If 8 workers can paint a wall in 6 hours, how many hours will it take 12 workers? (Assume constant rate)
4 hours