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huangjianhe135
27.08.2019 •
Mathematics
What is the sum of the exterior angles of a convex polygon?
a. 360
b. 180(n – 2)
c. 180
d. 360n
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Ответ:
A
Step-by-step explanation:
The sum of the exterior angles for each polygon is always 360°.
The sum of the interior angles for each polygon is always 180°(n-2).
If you have n-sided convex polygon, then
So,
Ответ:
Thus total amount will be:
x+y=375
⇒y=375-xi
also:
0.07x+0.02y=(375×0.05)
0.07x+0.02y=18.75...ii
substituting i in ii we get:
0.07x+0.02(375-x)=18.75
0.07x+7.5-0.02x=18.75
putting like terms together and simplifying we get:
0.05x=11.25
x=225 gallons
hence
y=375-225=150 gallons
thus
225 gallons of 7% and 150 gallons of 2% should be used.