Erin is experimenting with a simple electrical circuit. when she connects a light bulb to a battery, the light bulb begins converting electrical energy into light energy and heat energy. if the battery supplied 25 kilojoules of electrical energy to the light bulb, and the light bulb gave off 4 kilojoules of light energy, how much heat energy did the light bulb give off?

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2