Thanks for telling me! I'll try to work on this more.
8. 9/18 * 8/11= 1/2*8/11=4/11, first option.
9. Only one letter is a vowel and not an uppercase letter, so the probability to get an uppercase letter or consonant, is 9/10=0.9, first option.
1. This is combinations, 5C3= 5!/3! * 2!= 5*4/2*1=10, second option.
Does x=45/16?
3. 7C6= 7!/6! * 1!= 7/1=7, so the last option.
Nevermind, it's 25%, 100/12*15=125-100=25%
Thanks so much, CPhill!
Thanks so much, CPhill! Great job!
So, f(x)=0, that means 0=-4/5x+9, -4/5x=-9, x=-9*5/-4=45/4=11.25
