Step-by-step explanation:
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Answer:
a = 15
Step-by-step explanation:
Substitute b = 12 , a = 9 into the equation
12 = 
12 =
← square both sides
144 = a² - 81 ( add 81 to both sides )
225 = a² ( take square root of both sides )
±
= a , then
a = ± 15
a > 0 , so a = 15
The answer to your question is 220x210=2200
hope this helps good luck.
Answer:
£1.22
Step-by-step explanation:
Total cost: 5.95+1.62+0.25+2(0.48)=8.78
Change: 10-8.78=1.22
Answer:
25 Minutes
Step-by-step explanation:
Because 1000 ÷ 40 = 25