On Wednesday morning, a stock at 70 3/4 points. By the end of the day, the value of the stock was 7/8 of its starting value. The value of the stock at the end of the day Thursday was 10/7 of what it was at Wednesday’s closings. How many points was the value of the stock at the end of the day Thursday? Express your answer as a mixed number in lowest terms.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212

Marking brainliest for original answer.. are these two triangles similar? how can you tell?