3, 1, -1, -3, -5... ¿Qué número se encuentra en la posición 17 de la sucesión?

Ashopper bought a watermelon a pack of napkins and some paper plates in his state there was no tax on food the tax rate on non-food items is 5% the total for the three items he bought was 825 before tags and he paid $0.19 in taxes how much did the watermelon cost

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

If the perimeter of the square equals the perimeter of the regular pentagon. each side of a pentagon is 16cm long. how long is each side of the square?