I need help plss I just want to make sure if it’s right or wrong on this answer

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.