A restaurant serves sandwiches and salads. They sold 7 sandwiches and 7 salads for a total of $140 for lunch. In the evening, 21 sandwiches and 77 salads were sold for a total of $700. Let w represent the cost of a sandwich and d represent the cost of a salad.

Part A
Write and equation that represents the total cost at lunch time:
Write an equation that represents the total cost in the evening:

Part B
Find the cost of each sandwich (w ) using your system of equations above:

Which of the following is the result of expanding the series

Need same math paper but the back now i hope your able to read it cleary i need with hw

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 > ?