Sarai has decided to take a risk. she's been saving money and now she's ready to invest in stocks. most of her stocks give her a great return, but one–bambi's beach bonnets–is a mixed story. the value of her shares in bambi's beach bonnets over timem is modeled by the function v(t) = −2x 2 + 22x + 280, where v represents the value of her investment and t represents time in weeks. (a) what key feature of the function tells us when her investment was worth the most?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

The sum of two numbers is 86, and their difference is 20. find the two numbers

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.