What is the percent composition of nio if a sample of nio with a mass of 41.9grams contains 33.1 g ni and 8.8 o

Percent composition can be solve by:

( mass desired component)/ mass sample * 100

% Nitrogen of the sample NiO can be solved:

%Ni = ( 33.1 g Ni / 41.9 g NiO) x 100

%Ni = 79% Ni

% oxgen:

%O = ( 8.8 g O / 41.9 g NiO) x 100

%O = 21 % O

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.