The answer would be A) X=5
<em><u>Hey</u></em><em><u>!</u></em><em><u>!</u></em>
<em><u>They</u></em><em><u> </u></em><em><u>are</u></em><em><u> </u></em><em><u>adjacent</u></em><em><u> </u></em><em><u>angles</u></em><em><u>.</u></em>
<em><u>Both</u></em><em><u> </u></em><em><u>angles</u></em><em><u> </u></em><em><u>have</u></em><em><u> </u></em><em><u>common</u></em><em><u> </u></em><em><u>side</u></em><em><u> </u></em><em><u>and</u></em><em><u> </u></em><em><u>vertex</u></em><em><u>.</u></em>
<em><u>Hope</u></em><em><u> </u></em><em><u>it</u></em><em><u> </u></em><em><u>will</u></em><em><u> </u></em><em><u>help</u></em><em><u> </u></em><em><u>u</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>
Estimation for addition: 86 rounds up to 90 and 17 rounds up to 20 so:
90 + 20 = 110
Estimation for subtraction is the same thing but with subtraction
90 - 20 = 70
Now for the exact answers:
86 + 17 = 103
86 - 17 = 69
Your answers are 110, 70, 103, and 69.
Speed = Distance / Time
Distance = Speed*Time
For this problem, we should bear in mind that current speed has an impact on the boat speed...
for upstream, the boat goes against the current, and so its speed is
U = V - C
where V is the speed of the boat
C is the current speed
for downstream, it will be:
D = V + C
Convert the problem into mathematical equations:
4D + 3U = 116
3D + 4U = 108
4(V+C) + 3(V-C) = 116
4V + 4C + 3V -3C =116
7V + C = 116
3(V+C) + 4(V-C) = 108
3V + 3C + 4V - 4C = 108
7V - C = 108
Solving the equations:
7V + C = 116
7V - C = 108
14V = 224
V = 16km/hr —-> speed of boat
to get C:
7(16) + C = 116
C = 4km/hr
