Enter the value for x that makes the equation √x-7=-4

Ashopper bought a watermelon a pack of napkins and some paper plates in his state there was no tax on food the tax rate on non-food items is 5% the total for the three items he bought was 825 before tags and he paid $0.19 in taxes how much did the watermelon cost

Identify whether the figure has plane symmetry, symmetry about an axis, or neither.

What is the missing step in this proof ?