Given cy - 7 = 5d + 3y, we solve for y as follows:
cy - 3y = 5d + 7
y(c - 3) = 5d + 7
y = (5d + 7) / (c - 3)
Simplify the experssion and you get 10.
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Answer:

Step-by-step explanation:

Cos 300 = Cos ( 360 - 60)
= Cos 60

X=2
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Answer:
a) 12x + 22 b) 17
- x
Step-by-step explanation:
Perimeter is the sum of the each side length.
The first example is a rectangle so the (4x+8) and the (2x+3) are doubled.
(4x+8) x 2 = 8x+16
(2x+3) x 2 = 4x + 6
12x+22
(6
- 12x) + (2
+ x) + (9
+ 10x)
combine like-terms.
17
- x