7. which of the following is not a
rational number?
a. - 5/3
b. 9.
c. √81
d.100

Me what is the value of x? showing work would be appreciated - ! : )

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)