1−2+3−4+5−6 + ⋯ +101−102

What is (28 + 7 + 6 + 3) x 1/2 show your work

Aportion of a hiking trail slopes downward at about an 84° angle. to the nearest tenth of a flot, what is the value of x, the distance the hiker traveled along the path, if he has traveled a horizontal distance of 120 feet? a. 143.3 b. 12.5 c. 120.7 d. 130.2

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.