f.3 math

1(a)
√50
=√2x5x5
=5√2
=5p

1(b)
√20+√80
=2√5+4√5
=2q+4q
=6q

2(a)
√2+√8
=√2+2√2
=3√2

2(b)
√5(√125+√5)
=√5 (5√5+√5)
=√5 (6√5)
=30

2(c)
(√3+1)(√3-1)
=(√3)^2 - (1)^2
=3-1
=2

2(d)
(3-√3)^2
=3^2 - 2(3)(√3) + (√3)^2
=9 - 6√3 + 9
=18 - 6√3

4.
Let profit of each egg be $P,
cost of each egg be c,
selling price of each egg be s.

P=s-c,
12s=15c
4s=5c,

P/c x 100%
=4(s-c)/4c x100%
=4s-4c/4c x100%
=5c-4c/4c x100%
=c/4c x100%
=1/4 x100%
=25%

The percentage profit is 25%.

Too many questions....