exam Maths Puzzle Numerical Ability

1. Arsenic-74 is used to locate brain tumors. It has a half life of 17.5 days. Write an exponential decay function for 90-mg sample. Use the function to find the amount remaining a

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can someone please explain this problem to me

Write an equation in slope-intercept form that satisfies each condition.

passes trough (4.) and is parallel to x+2y=4

i wrot Find theta for 0 degrees < or = to (less than or equal to) theta < 360 degrees.
a) tan theta= 0.932,sin theta<0
b) sin theta= -0.192,tan theta<0
c) sec theta= 2.047, cot theta<0