PLEASE HELP!! I beg of yall All three questions have the same triangle which is used in the first photo attached!
I'm supposed to match the Trig function with the correct ratio.

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.