-7r + 6u - 5t....when r = 3, u = -3, and t = -2
-7(3) + 6(-3) - 5(-2) =
-21 - 18 + 10 =
- 39 + 10 =
-29 <==
=================
-3x - 2y + 4z....when x = 2, y = -1, and z = -5
-3(2) - 2(-1) + 4(-5) =
-6 + 2 - 20 =
-26 + 2 =
-24 <==
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2a - 6b - 7c...when a = -5, b = 2, and c = 4
2(-5) - 6(2) - 7(4) =
-10 - 12 - 28 =
- 50 <==
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(4a - 8) / (-2a + 6)...when a = 4
(4(4) - 8) / (-2(4) + 6) =
(16 - 8) / (-8 + 6) =
8 / -2 =
-4 <==
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(3x + 2y) / (2x + y)...when x = -4, and y = 3
(3(-4) + 2(3) / (2(-4) + 3) =
(-12 + 6) / (-8 + 3) =
-6 / -5 =
6/5 <==
==============
percent increase = (new number - original number) / original number...* 100
percent increase = (18.3 - 15) / 15...* 100
percent increase = 3.3 / 15....* 100
percent increase = 0.22 * 100
percent increase = 22% <==