Find the standard form of the equation of the parabola with a focus at (-4, 0) and a directrix at x = 4. y2 = -8x
16y = x2
y = negative one divided by sixteenx2
x = negative one divided by sixteeny2

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Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?

Zach spent 2/3 hour reading on friday a 11/3 hlurs reading on saturday. how much more time did he read on saturday tha on friday