algebra for ya?

Question

sq= the square foot sign
1) sq of 200
a) 10 sq of2 b) 2 sq of100 c) 2 sq of 25
2)5 sq of20 - 6 sq of32
a)10 sq of2 - 12 sq of13 b)10 sq of5 - 6sq of2 c)10sq of5 - 24sq of2
3)There are 40 dimes and quarters in a drawer. Peggy counts them and determines their value to be $4.75. How many coins of each type are there?
a)6 quarters and 34 dimes b)10 quarters and 30 dimes c)5 quarters and 35 dimes
4)The sum of two numbers is 72. The difference of the numbers is 26. What are the numbers?
a)46 and 26 b)51 and 21 c)49 and 23
5)4k - kxy + 4pc - pcxy
a)(4 + xy)(k - pc) b)(4 - xy)(k + pc) c)(8 + xy)(k - pc)

Answer 1

sq rt of 200= sq rt 100xsq rt 2=10(sq rt 2)
5(sq rt20)= 5(sq rt4)(sq rt5) =10sq rt 5
6(sq rt32)=6(sq rt 16)(sq rt 2)=6*4(sq rt 2)=24(sq rt 2)so
10(sq rt 5)-24(sq rt 2)
.1x+.25y =4.75
40-x=y
.1x+.25y=4.75
-x-y=40
x+2.5y=47.5
1.5y=7.5
y=5
40-5=35
35 dimes and 5 quarters

x+y=72
x-y=26
2x=98
x=49
y=72-49
y=23

Answer 2

# 4 is letter c

Answer 3

1. a
2.c
3. c
4. c
5.b