Dave bought 3 pencils, 8 markers, and 5 pens. he wants to know how many items he bought in all. he added 3+5 first. what should dave add next?

Step-by-step explanation:

you never added any of the pencils,pens,or markers prices. If you can add that then I will answer

8 but you could add the first two and then add 8

Step-by-step explanation: Because  there are three numbers and you already took two out of the three its called process of elimination.

mujhko hui na

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.