Molly and Jake go for a hike. They hike 7 miles before lunch. After lunch they continue to hike at a rate of 3 miles per hour. They hiked a total of 16 miles that day. Which equation can you use to find the number of hours h they hiked after lunch?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

Which situation is an example of an observational study?