Answer:
9450
Step-by-step explanation:
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30 students, or 100% are in Mr. Holland's music class.
30% of 30 play in a school band.
[NOTE: How to calculate percentage of something]
*100% times 0.[%]*
30 times 0.30 = 9.
Answer: 9 students play in a school band.
Answer:
324 cm²
Step-by-step explanation:
→ Work out perimeter of square
72 + 72 + 72 + 72 = 288
→ Work out the width of the rectangle
288 - (90 × 2) = 108
108 ÷ 2 = 54
→ Work out area of square
72 × 72 = 5184 cm²
→ Work out area of rectangle
90 × 54 = 4860 cm²
→ Minus the areas from each other
5184 cm² - 4860 cm² = 324 cm²
The problem gives you the area, it tells you to find the height which is 8.48528 or 6 root 2