Find the slope ; (6,2), (5, 4)

Can someone help me with this one please ?! And thanks !

The two-way frequency table below shows data on playing a sport and playing a musical instrument for students in a class.

∆red ≅ ∆ by rule will give brainiest if possible

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.