Answer:
There are 32 pupils in the class
Step-by-step explanation:
Let's say there are N pupils in the class. Then each pupil must send N-1 cards - because it would make no sense to send one to themselves! So each of the N pupils send N-1 cards, which becomes 992 cards in total. In equation form, this is
This is a second degree polynomial, which has the solutions
where
If we insert these numbers in the equation,
If we choose the solution with the minus sign, we get
N=-31
but this makes no sense! There can't be a negative number of pupils in the class!
So we choose the solution with the plus sign,
So there are 32 pupils in the class
Surface area = 2(wl + hl + hw) = 2wl + 2hl + 2hw
Conditions:
base length is shrunk by a factor of 2/3
width is quadrupled
height is cut in half.
l ⇒ 2l/3 w ⇒ 4w ; h ⇒ h/2
SA = <span>2wl + 2hl + 2hw
</span>SA = 2(4w)(2l/3) + 2(h/2)(2l/3) + 2(h/2)(4w)
SA = (16wl/3) + 4hl/6 + 8hw/2
Simplify:
SA = 16/3 wl + 2/3 hl + 4hw Choice C.
Answer:
2nd one
Step-by-step explanation:
as it is a negative number so the point on the number line should move backwards
Answer:
1 1/2
Step-by-step explanation:
Rise over run so x2-x1 / y2-y1
9/6=3/2