What formulae can be used to solve quadratic equation in two variables?

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.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?

Solve for x and select the correct answer