How do i do this? i think i solved for z=24 but i'm not totally sure. i'm confused on how to solve for x and y mostly. we are using ratios to solve anyone ?

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

Given that abcd is a rhombus, what is the value of x?

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.