Are the following sets vector spaces with the indicated operations? if not ,why not?

1) the set v of non negative real numbers, ordinary addition and scalar multiplication.
2) the set of all polynomials of degree < =3; operations of p.
3) the set v of all 2x2 matrices of the form [ab][0c]; operations of m22
4) the set v of 2x2 matrices with zero determinant; usual matrix operations

what is the original number? you forgot to add it.

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.