PLEASE HELP

Given the directrix of y = 6 and focus of (0, 4), which is the equation of the parabola?

y = −1/4x²+ 5

y = −1/4x²− 5

y = 1/4x²+ 5

y = 1/4x²− 5

Si la base de un triángulo isósceles mide 70 m y el ángulo opuesto a ésta mide 58°; entonces ¿cuánto mide la altura de dicho triángulo? a) 21.87 m. b) 40.01 m. c) 43.74 m. d) 63.14 m.

What is r i 4.5+10r=-6.5 with work pls

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?