Which is a quadratic function? O f(x) = 2x +x+3
O f(x) = 0.x2 - 4x +7
O f(x) = 5.2 - 4x + 5
O fx) = 3.83 + 2x + 2

6.9

step-by-step explanation:

simple math really

6 1/2 times 0.6 = 3.9

but if you are just doing 6 and not 6 1/2 then the answer is 3.6

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.

sine

step-by-step explanation: