Please help
What is the pH of substance which has a hydronium ion concentration of 5.4 x 10-9? And what type of substance is it?

(pH = -log[H3O+])

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up

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?