The discount is 25% of $40:
40×0.25=10.
Subtract the discount from the original price:
40−10=30.
You pay $30.
Subtract 5 from both sides:
3𝑥=15.
Divide both sides by 3:
𝑥=5.
The formula for the perimeter of a rectangle is:
2×(length+width).
Substitute the values:
2×(10+6)=2×16=32 cm.
Find the greatest common divisor (GCD) of 8 and 12, which is 4. Divide both numerator and denominator by 4: ⁸⁄₁₂ ÷ ⁴⁄₄ = ⅔
To calculate the mean:
Mean = Sum of numbers
Number of items
Sum of the numbers:
5+8+10+7=30.
Number of items: 4.
Mean = ³⁰⁄₄ = 8
