solve the simultaneous equations using the matrix method . a) 2x+3y = -8 5x- 2y=18 b) 3x + 4y =14. -2x+ y = 9

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

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.

Average acceleration: i have no idea how to do this.