A box contains 4 plain pencils and 4 pens. A second box contains 5 color pencils and 7 crayons. One item from each box is chosen at random. What is the probability that a pen from the first box and a crayon from the second box are selected? Write your answer as a fraction in simplest form.
PLEASE HELP THIS IS FOR A TEST IF YOU PUT A LINK I WILL REPORT YOU SO PLEASE NO LINKS ALL I WANT IS HELP ON MY QUIZ PLEASE :(

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)