9x^(2)+y^(2)=18 find all the vertices

What is sin 7x/4 ? i need on this urgent trig

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)