When Riley left her house in the morning, her cell phone battery was partially charged. The charge remaining in Riley's battery, as a percentage, can be modeled by the equation, B=40−5t, where t is the number of hours since Riley left her house. What is the x-intercept of the equation and what is its interpretation in the context of the problem?

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

Acircle has a circumference of 2 pi cm. which statement about the circumference and area is true? a comparison of the area and circumference is not possible since the area cannot be determined. the numerical values of the circumference and area of the circle are equal. the numerical value of the circumference is greater than the numerical value of the area. the numerical value of the circumference is less than the numerical value of the area.

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?