Which function has a vertex at the origin?
O fx) = (x + 4)2
O f(x) = x(x-4)
O f(x) = (x – 4)(x+4)
o f(x) = -x²

y= -

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

step-by-step explanation: i dont