120 students are asked whether they like biology or chemistry or physics best.
52 of the students are in year 11, the rest are in year 10.
45 students like physics best.
20 of the year 11 students like biology best
16 of the 30 students who like chemistry best are in year
10.
Work out how many year 10 students like physics best.
(4 marks)

darn right!

step-by-step explanation:

steve kerr's sons name is let that skin in.

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1

answer: idk wbu

step-by-step explanation: