I really could use the help with these math word problems. I need explanation with it too please and thank you.

8. Joe can chop vegetables in 5 minutes, and Rich can chop the same amount of vegetables in 4 minutes. Working
together, how long will it take them to chop that batch of vegetables?

9. At Ricardo's Tacos, four tacos and two orders of chips cost the same as two tacos and four orders of chips. If
Ricardo's charges $2.00 for a single order of chips, how much does Ricardo's charge for 1 taco?

10. Broccoli is $1.69 per pound. Meg paid $8.45 for broccoli. How many pounds did she purchase?

Solve the formula ax+ by = c for x.

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.

I've been working on this for a few days and i just don't understand, it's due in a few hours. you. the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α. part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part b suppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i.e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case. part c now try a numerical problem. what is the direction of the vector w = < -1, 6 > ?