Angle a and angle b are vertical angles. If the measure of angle a = (3x - 30) and the measure of angle b = (2x - 9), then find the value of x

Write 17/20 as a decimal and as a percent.

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest

I’m confused on how to work the pie charts