Perform the operation.
(4x^2+9x-7)-(-7x^2+5x-1)

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Identify the number as a rational or irrational. explain. 127

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?