Which ion is not an oxyanion? no− so4 2− cn− co3 2−

CN⁻

Explanation:

Oxyanion:

Oxyanion is the anion that have oxygen atom.

General formula:

The general formula for oxyanion is AₓOₓ⁻².

A = symbol of element combining with oxygen.

O = oxygen atom

z,x, = integers

a) =  NO⁻

Its is an oxyanion because oxygen atom is present with nitrogen.

b) = SO₄⁻

It is an oxyanion because oxygen atom is present.

c) = CN⁻

This is not an oxyanion because there is no oxygen atom present.

d= CO₃²⁻

It is also an oxyanion because of presence of oxygen atom.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.