Steve uses an app that shows him how many kilometers he has to run to prepare for a marathon the app said he ran 6.436 km he wants to post online how many miles you ran steve ran

If square root x = -7, then x= -49 true or false

Can someone me with these two circle theorem questions asap?

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?