Solve and round to nearest hundredth please.

-0.10

Step-by-step explanation:

First, collect terms that are not raised to power hence 13+5=18

Now set up 18 to a base of 3 ie 3^{y}=18 and to find y we shall put natural logarithm both sides hence y ln3=ln 18. Therefore,

Now since both bases at LHS and RHS are same, ie 3 then

8x+4=3.1753979320439729421166809645352357128792

8x=−0.824602067956

X=−0.103075258494

Rounded off, x=-0.10

b, i believe, but not sure.