What is5400300 in standard form

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.

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?