In how many ways can 4 boys and 5 girls sit in a row if the boys and girls must alternate?

What is the y-intercept of the line given by the equation

3x + 4y = 5 x- 3y = -7 solve by substitution

The perimeter of a rectangular lot of land is 436 ft. this includes an easement of x feet of uniform width inside the lot on which no building can be done. if the buildable area is 122 ft by 60 ft, determine the width of the easement. select one: a. 9 feet b. 18 feet c. 4.5 feet d. 7 feet