The cost of long distance telephone call is determined by a basic fixed charge for the first 5 minutes and a charge for each additional minute. If a 15-minute call costs $3.50 and a 20-minute call costs $4.75, what is the
total cost, in dollars, of a 40-minute call?

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.

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?