A circle has a diameter of 12 yd. What is its circumference? Use 3.14 for 11, and do not round your answer. Be sure to include the correct unit in your answer.

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

Can someone tell me if this is perpendicular? !

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.