Calculate the molar mass of Li2SO4.

109.94 g/mol

Explanation:

Li is 6.94 and there's 2 of those = 13.88

1 S = 32.06

4 O = 63.996

Add all of those together to get 109.936 round to 109.94

its mg hope this

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.