Write the equation of a line perpendicular to the line y=(-1/2x)-4 that passes through (1, -7) in point slope form

Use the normal approximation to the binomial distribution to answer this question. fifteen percent of all students at a large university are absent on mondays. if a random sample of 12 names is called on a monday, what is the probability that four students are absent?

Solve the equation x/4 - 5= -8 -27 -12 -7 12

Me. i can't figure out this question. give an explanation too. .