Pls help i have no idea how to do this :/

Abcd is a parallelogram find the valuse of x

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Abarbecue sold 26 hamburgers and hot dogs. hamburgers sell for $3.50 each and hot dogs sell for $2.00 each. if the barbecue made $70 in sales, determine and state the number of hot dogs sold.