S=(n/2)(A+t)
x2 x2
2S=n(A+t)
--- --------
n n
2S n(A+t)
---=---------
n n
2S
---=A+t
n
.....2S
A=----- -t
......n
1) 40-25= 15
2) 15/3=5
3) each gift costs $5
Then to check:
1) 5x3=15
2) 25+15=40
Therefore p=5
Answer:
13/24
Step-by-step explanation:
just took the test
i) x²
ii) (x-10)²
b) (x-10)² = x² - 20x + 100
c) (30-10)² = 400 cm²
d) (x-10)² = 144 => x-10 = √144 => x = 12 + 10 = 22 cm
