What is the measure of angle b in the triangle?

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m∠b=
°

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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?

Which is the focus of a parabola with equation y2=4x