0.555 what us value hundredths

Given that abcd is a rhombus, what is the value of x?

In an equilateral triangle, each angle is represented by 5y+3. what is the value of y? a. 9.7 b. 10.8 c. 11.4 d. 7.2

What are the solutions of the following system? y=-2x^2 y=x-2