What is an equation of the line that passes through the points (-5,4) and (5,-8)

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?

Change negative exponents to positive. then solve. round to four decimal places

Which equation represents a line that passes through the point (9, -4) and has a slope of 3/5?