The following table shows the number of textbooks classified by subject and condition. Art STEM Business New 75 50 25 Used 125 100 25   What is the probability that a randomly chosen textbook was New OR it was for Business? Report your answer to 4 decimal places. 

Let  A and B be  n×n n \times n matrices. If  A is invertible and B  is not invertible, determine if  AB is invertible or not. 

  A professor reports that 19% of students have perfect attendance during the semester.   In a class of 17 students, what is the probability that exactly 5 had perfect attendance? 

What is the formula for \(\frac{d}{dy}f(3,y)\)? Type your answer in the box. 

Let ∑n=1∞an \sum_{n=1}^{\infty} a_n be a series whose nth partial sum is Sn=nn+2 S_n = \frac{n}{n+2} .Find. a1a_1 and a4 a_4

This quiz is designed to assess your understanding of the sequence and series. It serves as a review of key concepts that will be foundational for success in this course. The quiz is an open book and open notes, but you are not allowed to use any other resources, including online materials or help from others. You have up to 5 attempts to complete this quiz, so take your time and ensure you fully understand each question. Be sure to show all your work for full credit.Quizzes must be submitted by 11:59 PM on Wednesday.  To receive full credit, you must also submit your work through GradeScope. Please make sure all work is clear and complete to maximize your score.

Please upload a pdf or image of your solution.  Be sure to have ALL WORK SHOWN for credit.  Zero credit will be awarded if no work is shown.  Partial credit may also be awarded. The inner gray shaded circle shown represents a cross-sectional view of an insulating sphere of radius 10 cm with a total charge of +65 nC distributed uniformly throughout.  Surrounding this sphere is an insulating spherical shell (outer blue shaded ring) with a total charge of -65 nC distributed uniformly throughout.  There is empty space between the inner gray sphere and blue spherical shell as well as outside of the blue spherical shell.  The inner radius of the blue spherical shell is 25 cm and the outer radius is 30 cm. The magnitude of the electric field is to be determined at each of the positions indicated.     a.) (1 point) What is the electric field at point A (7 cm from center of inner sphere)? b.) (1 point) What is the electric field at point B (18 cm from center of inner sphere)? c.) (1 point) What is the electric field at point C (28 cm from center of inner sphere)?  d.) (1 point) What is the electric field at point D (40 cm from the center of the inner sphere)?

In the current shown below, what is the current in resistor R?

What is the change in potential energy of a proton that is moved by a uniform 10.0 N/C electric field through a distance of 18.0 cm?

Spheres 1, 2, and 3 are three identical conducting spheres that have been placed on top of insulating stands.  Sphere 3 is connected to ground and is initially neutral, while spheres 1 and 2 each have an initial positive charge.  The spheres are far enough apart that they do not affect the charge distribution on each other.  A student brings the spheres in contact with each other, two at a time, in the following order. Sphere 1 is brought into contact with Sphere 2 and then returned to its initial position.  Sphere 2 is brought into contact with Sphere 3 and then returned to its initial position.  Which of the following correctly relates the final net charges Q1, Q2, and Q3 of the three spheres?