Solve the linear equation 1/2x+10=1/4x+54
i can never do the fraction ones.

Which matrix multiplication is possible?

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.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?