What do 7-(-14) equal

What is the y-intercept of the line given by the equation

Eiko is wearing a magic ring that increases the power of her healing spell by 30%30\%30%30, percent. without the ring, her healing spell restores health points. which of the following expressions could represent how many health points the spell restores when eiko is wearing the magic ring?

If the figures below are similar give the scale factor of figure a to figure b