Assume that y varies inversely with x and that y is 2 when x is 4. which of the following is the equation of inverse variation?

y = 2x

xy = 8

y/x = 2

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year. how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

Can someone me out here number 4 plz

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom