Will give brainliest suppose that y varies inversely with x, and y=3 when x=5 what is an equation for the inverse variation? this is my last problem on my assignment

What is the y intercept of f(x)=(1/2)^x?

If angle b measures 25°, what is the approximate perimeter of the triangle below? 10.3 units 11.8 units 22.1 units 25.2 units

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.