Aprofessor using an open source introductory statistics book predicts that 10% of the students will purchase a hard copy of the book, 55% will print it out from the web, and 35% will read it online. at the end of the semester he asks his students to complete a survey where they indicate what format of the book they used. of the 200 students, 25 said they bought a hard copy of the book, 85 said they printed it out from the web, and 90 said they read it online.

12.5% bought a hard copy. 42.5% printed it from the web. And 45% read it online.

Step-by-step explanation: Since there are 200 students in total, think of 200 as 100% of students. You would divide 25/200 which equals 0.125 then multiply 0.125 times 100 which is 12.5 or 12.5%. Same process with the other numbers (85/200)x100=42.5   (90/200)x100=45. Hope this is what the question was asking

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it

asdsad

step-by-step explanation: