Answer:
Given sum represents the area under the curve 
and above x-axis in the interval ![[0, \frac{\pi}{4} ]](https://tex.z-dn.net/?f=%5B0%2C%20%5Cfrac%7B%5Cpi%7D%7B4%7D%20%5D)
Step-by-step explanation:
The correct answer for the question that is being presented above is this one: "(1) <span>For all real numbers a and b, a + b = b+ a; </span>(2) For all real numbers a and b, ab = ba; (3) <span>For all real numbers a, b and c, (a + b) + c = a + (b + c); (4) </span><span>For all real numbers a, b and c, a (b + c) = ab + ac." </span>
Answer:
5
Step-by-step explanation:
5 + 4 + 3 − 8 + 7 − 6
= 9 + 3 − 8 + 7 − 6
= 12 − 8 + 7 − 6
= 4 + 7 − 6
= 11 − 6
= 5
Answer:
90
Step-by-step explanation:
