Aparabola has a vertex at (0,0). the focus of the parabola is located on the positive y-axis. in which direction must the parabola open? up down left right

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?

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!