paul has a total of 15 markers and pencil. Each pencil cost $0.30 and each marker costs $1.25 how many pencils did paco buy.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39