Find the standard form of the equation of the parabola with a vertex at the origin and a focus at (0, -7).

So hmmm notice the picture below

we know the vertex is at the origin, and the focus at 0,-7

now, notice the distance "p", which is the distance between the vertex and focus or directrix

based on the given points, we know the parabola is vertical, and opening downwards, thus, the squared variable is the "x"

thus 

plug in the values for it then

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle