Adriving distance is 650km. the distance shown on a map is 4 cm. express the map scale in words.

What is the binomial expansion of (2x-3)^5

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

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.