Iwill make you the brainest answer in 5 minutesand get 10 points 1. glen makes 4% commission on his sales. if he makes a sale of $12,000, how much commission does he make? 2. bryan earns $200 each week, and 12% commission for each car sale he makes while working at a used car dealership. if he sells a used car for $2,000, how much money does he make that week? 3. rosa and her friends are eating out for dinner. the bill was $45.80. they want to leave a 20% tip. how much should they leave for tip ? 4. the rodriguez family went to dinner at pasta palace. the family ordered food that totaled $42.50. the sales tax rate was 7.25% and they left a 15% tip. how much was the total bill?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?