Math 8 Review #2

Solve: 2/3(n + 6) = 10

• -6
• 6
• 9
• -9

Translate: 
Four times a number plus six IS 30.

• 4 + 6 = 30
• 4x + 6 = 30
• x + 4 times 6 = 30
• 30 = 4x

Solve the following equations
3x +2y=10
8x-2y=12

• x=2, y=3
• x=-2, y=2
• x=2, y=2
• x=-2, y=3

Kristin spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15.  If she bought a total of 7 then how many of each kind did she buy?

• 3 fancy 4 plain
• 5 fancy 2 plain
• 2 fancy 5 plain 
• 4 fancy and 3 plain

Solve the equation
4x+60=400

• 85
• 115
• 1360
• 40

3.) Simplify
(45x⁶y²)/(5x⁴y⁹)

• (9x²)/y⁷
• 40x²y⁷
• 9x²y⁷
• 9x¹⁰y¹¹

7.) The area of a rectangle is 36x⁶y⁴ square units.  What is the length if the width is 9x²y³?

• 27x³y^4/3
• 27x⁴y
• 4x⁸y⁷
• 4x⁴y

8.)  What is the area of the circle that has a radius of 5a⁴?  {Area= ∏r²}

• 5∏a⁶
• 10∏a⁸
• 25∏a⁸
• 25∏a¹⁶

How would you write 4.3756 x 10⁴ in standard form?

• 437,560,000
• 0.00043756
• 43,756
• 4,3756

How would you write -5.6 x 10^-3 in standard form?

• 0.0056
• -5,600
• 0.00056
• -0.0056