X+y=5
x^y+y^x=17
solve for the value of y and x

Ateacher brought a pack of 17 batteries . each calculator uses 3 batteries . how many calculator can the teacher fill with batteries

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities

Convert the polar representation of this complex number into its rectangular form: z=5(cos pi+i sin pi)