Math Review

Math Review

Area and Perimeter (circle), Exponent Rules, Percentages.

AREA & PERIMETER

• CIRCLE AREA=Πr²

• CIRCLE PERIMETER= 2Πr

Multiple Select

A circle has an area of 49Π, it's diameter is

• 14

• 7

• 4.9

• Π

• 49

Exponent Rules

Multiple Choice

Simplify the expression  $\frac{\left(\text{t}^3\times t^2\right)^2}{t\times t^2\times t^3}=?$  

• 1

•  $t^2$  

•  $t^4$  

•  $t^8$  

•  $t^{10}$  

Percentages

• Per cent = per hundred or /100

• to calculate 15%. Multiply by 15 divide by 100

  
  

• To reduce a price by 10% take amount multiply by 10 divide by 100 and then subtract the resulting number from the original number.

• Example: Original cost $30 less 10% (30x10=300/100=3 then subract this from original amount 30-3). = $27

Multiple Choice

During the end of the year sale, all items are discounted 20%. If a shirt has a price tag of $30 and a pair of jeans has a price tag of $40, how much will they cost during the sale?

• $14

• $50

• $54

• $56

• $62