11. Simplify: {(5/2×1/10)+ 7/3 × 5/2} - (4/3 ×13/8) 12. Write any 5 rational numbers between −5/7 and 7/8 13. Subtract the sum of −2/3 and 1/3 from the sum of 5/3 and −4/3. 14. Divide the sum of 18/5 and −71/5 by their difference. 15. What should be added to (1/2+1/3+1/5) to get 4?

the answer for this question is : 360°

step-by-step explanation:

we have been given a triangle   we need to tell which one of these is a triangle below to map onto itself.

360° rotation is the complete rotation which eventually leads to the same figure which is given.

the correct will be, that is 360° that will cause the triangle below to map onto itself.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: