Hi! Can someone check this and see if they are correct? Thanks!

Question

1.) Which value of x should the expression be further simplified? √(21)x

a.) 5
B.) 6
c.) 11
D. 55

My answer: a

2.) 2√43x is show: Which value of x makes the expression equivalent to 14√43?

a.) 7
b.) 12
c.) 49
d.) 98

My answer: a

3.) Which value of x should the expression be further simplified? √(55)x

a.) 7
b.) 12
c.) 13
d.) 15

My answer: d

Answer 1

I answered a similar question yesterday
http://www.jiskha.com/display.cgi?id=1412431497

The way you placed your brackets, none of your choices are correct