Assume that random guesses are made for 7 multiple-choice questions on an SAT​ test so that there are n=7 ​trials, each with a probability of success​ (correct) given by p=0.5. Find the indicated probability for the number of correct answers. Find the probability that the number x of correct answers is fewer than 4.
P(x < 4) = ?

What are the sotions to the quadratic equation 9x^2=4

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)

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why?