9.6x10^85/3x10^63 in scientific notation

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?