20 POINTS! A new tv is priced $850, but is on sale for 15% off and is subject to 6.5% sales tax. How much will the tv cost altogether?

Me. i can't figure out this question. give an explanation too. .

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.

The product of sin 30 degrees and sin 60 degrees is same as the product of