Which of the statements is true about the data displayed in the scatter plot? Study Time vs. Test Grades
100
90
80
Grade
60
15 30 45 60
Study Time (min)

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

Precalculus question, image attached.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?