John swam 0.86 km each day for 3 weeks. how many meters did he swim in those 3 weeks?

Combine like terms7y^2 + 7(6y^2 − 8)

Thanh and her crew are building a stage in the shape of a trapezoid for an upcoming festival. the lengths of the parallel sides of the trapezoid are 14 ft and 24 ft. the height of the trapezoid is 12 ft.what is the area of the stage? enter your answer in the box. ft²

I’m really confused and need your assist me with this question i’ve never been taught