Answer:
see explanation
see explanationStep-by-step explanation:
21
Note that
(a -
)²
= a² - 2 + 
= a² +
- 2
= 11 - 2
= 9
Thus
(a -
)² = 9 ( take the square root of both sides )
a -
= 3
22
Since the expression is a perfect square, then
(4x + 5y)²
= 16x² + 40xy + 25y²
Comparing coefficients, then
a - 1 = 40 ( add 1 to both sides )
a = 41
23
99² - 87² ← is a difference of squares and factors as
= (99 - 87)(99 + 87)
= 12 × 186 = 1152, thus
24a = 1152 ( divide both sides by 24 )
a = 48
Answer:
GE=10
FJ=5
Step-by-step explanation:
We know that in a traingle

a=HE=6
b=FE=8
Once we enter it into the equation, we find that we get
36+64=100
The square root of 100=10
GE=HF so HE=10.
Half of HE(10) is FJ(5)
Hope this help :)
Answer:
10
Step-by-step explanation:
2*3=6
6+c
6+4=10