4. You remove the brackets
Remember:
-a × -b = positive ab / +ab
a × b = positive ab / +ab
-a × b = negative ab/ -ab
a × -b = negative ab / -ab
Where ab is the product of the two numbers & - or + are the signs.
a) 5(2x+3y) -4(3x-5y)
= 10x + 15y -12x + 20y
= 10x - 12x + 15y + 20y
= -2x + 35y
= 35y - 2x [I've been told that most people prefer the positive number in front rather than the negative number]
b) x- 2(x+ 3y) -(2x+3y) -4(x+y)b
= x - 2x - 6y - 2x - 3y - 4x - 4y
= x - 2x - 2x - 4x - 6y - 3y - 4y
= -7x - 13y
c) 3(a + 2b -2) -2(2a - 5b - 1)
= 3a + 6b - 6 -4a + 10b + 2
= 3a - 4a + 6b + 10b - 6 +2
= - a + 16b - 4
= 16b - a - 4
The percentages from the different samples will have a true population percentage mean.
A real population proportion shows the percentage of a population that exhibits a particular trait.
A population's proportions will have a real population proportion mean if numerous big random samples or repeats of the same size are taken.
Here is an illustration of how to cross multiply, or find a cross product. In this instance, you multiply 3 x 10 to get 30 and then 5 x 6 to get 30. The proportion is accurate because the two products are equal.
Learn more about true population proportion here: brainly.com/question/13711224
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Original equation x = yz / a solve for a
xa = yz
a = yz / x
