Solve for X. Need help with this simple maths question as soon as possible. Thanks. Question attached

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

The four students in the table below each recorded the time and distance traveled while exercising. exercising distance (miles) time (minutes) gia 2 30 harris 5 50 ian 3 40 jackson 4 80 which list ranks the students from fastest walker to slowest walker? jackson, gia, ian, harris harris, jackson, ian, gia harris, ian, gia, jackson jackson, harris, ian, gia