Harper wrote the expression 15-6+7 to represent "15 minus the sum of 6 and 7". evaluate 15 - 6 + 7 and then exposing why harper's expression is incorrect

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm