Three times the sum of a number and seven is two less than five times the number. . a. 3x+7=5x-2. b. 3(x+7)=5x-2. c. 3(x+7)=2-5x
1 answer:
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Answer:
A. The variable x in the first equation has a coefficient of one so there will be fewer steps to the solution.
Step-by-step explanation:
Given
Required
Efficient way of solving the equations
<em>The efficient way of solving this problem is by solving for x in the first equation because it has a coefficient of 1;</em>
The evidence is shown as follows;
<em>Make x the subject of formula in equation 1</em>
<em>Substitute 1 + 3y for x in equation 2</em>
<em>Open bracket</em>
<em>Make y the subject of formula</em>
<em>Divide both sides by 23</em>
Recall that x = 1 + 3y
<em>Substitute 0 for y in the above expression</em>
Solving for y in the second equation will take more steps
Answer:
hello your question is incomplete below is the missing parts of the question
answer : K = 80
Step-by-step explanation:
P [ x ≤ 1 ] < 0.1
determine how large k have to be
note : n = k
sample proportion = 0.01
E = 0.05 - 0.01 = 0.04
applying this formula below
E =
0.04 = 1.645 make n subject of the equation
n = 80.3353
hence the value of K ≈ 80
