-1.8h-0.7 You combine like terms.
let's firstly convert the mixed fractions to improper fractions and then multiply across.
![\bf \stackrel{mixed}{1\frac{8}{10}}\implies \cfrac{1\cdot 10+8}{10}\implies \stackrel{improper}{\cfrac{18}{10}\implies \cfrac{9}{5}}~\hfill \stackrel{mixed}{5\frac{1}{2}}\implies \cfrac{5\cdot 2+1}{2}\implies \stackrel{improper}{\cfrac{11}{2}} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{9}{5}\cdot \cfrac{11}{2}\implies \cfrac{9\cdot 11}{5\cdot 2}\implies \cfrac{99}{10}\implies 9\frac{9}{10}](https://tex.z-dn.net/?f=%5Cbf%20%5Cstackrel%7Bmixed%7D%7B1%5Cfrac%7B8%7D%7B10%7D%7D%5Cimplies%20%5Ccfrac%7B1%5Ccdot%2010%2B8%7D%7B10%7D%5Cimplies%20%5Cstackrel%7Bimproper%7D%7B%5Ccfrac%7B18%7D%7B10%7D%5Cimplies%20%5Ccfrac%7B9%7D%7B5%7D%7D~%5Chfill%20%5Cstackrel%7Bmixed%7D%7B5%5Cfrac%7B1%7D%7B2%7D%7D%5Cimplies%20%5Ccfrac%7B5%5Ccdot%202%2B1%7D%7B2%7D%5Cimplies%20%5Cstackrel%7Bimproper%7D%7B%5Ccfrac%7B11%7D%7B2%7D%7D%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill%5C%5C%5C%5C%20%5Ccfrac%7B9%7D%7B5%7D%5Ccdot%20%5Ccfrac%7B11%7D%7B2%7D%5Cimplies%20%5Ccfrac%7B9%5Ccdot%2011%7D%7B5%5Ccdot%202%7D%5Cimplies%20%5Ccfrac%7B99%7D%7B10%7D%5Cimplies%209%5Cfrac%7B9%7D%7B10%7D)
Exponent 10 to the 5th power, answer 100,000
The answer is 1
Use the discramnt formula

Where a is 81, B is 18, and c is 1
We get

We then get 324-324=0
Which equal 0. Since the discramnt produce 0, the number of solution is one and repeated.
4 on the out side 923 in the inside