The owner of target uses the expression "r - 0.2r" to calculate the sales price of each piece of decor he is discounting. in the expression, r represents the regular price of the decor item. which of the following is equivalent to the expression?

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Me with this one question, and i'll upvote the brainliest answer

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?