Answer:
1233cm^2
Step-by-step explanation:
a of triangle = 1/2 bh
1/2 x 12 x 9 = 54
108 x 2 = 108
a of regtangle = l x w
25 x 15 = 375
375 x 3 = 1125
total surface area = 1125 + 108 = 1233cm^2
C because there is 180 degrees in a triangle. 147+17=164 and 180-164 is 16
Answer:
In your equations, there is only one variable you're using: y. I do not know what you mean by 2 variables, but probably you copied the wrong equations.
......Anyways......
To solve it, you must know that the sum of all 3 angles of a triangle is 180°.
To set up the equation, add all three angle measures on one side of the equation, and then 180 on the other side. It should be like this:
(6y+1)+(4y-7)+(9y+3) = 180
Now that you're done with the set-up, I assume you know what to do next. We can't always do the work for you. ^_~
> Add up the measures of each angle.
> Isolate the equation with only variable on one side and only number on the other side.
> Substitute each variable y for each angle measure and solve it.
Hope this helps a lot. ^_^
Step-by-step explanation:
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