What is the value of x in the diagram? A. 100 B. 60 C. 50 D. 120
2 answers:
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Answer:
Correlation coefficient ≈ 0.9445
This indicates that the weight of a student increases as the height of the student increases.
Step-by-step explanation:
The rest of the question is the following table
value of x (<u>height</u>) are 58, 59, 60, 62, 63, 64, 66, 68, 70
Value of y (<u>weight</u>) are: 122, 128, 126, 133, 145, 136, 144, 150, 151
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To calculate the correlation coefficient we will use the following form:
So, n (the number of terms) = 9
∑x = 570, ∑y= 1236, ∑ x²= 36234, ∑ y²= 170694 and ∑xy=78617
So, the correlation coefficient =
∴ r = 0.9445
So, weight of a student increases as the height of the student increases.
Equation #1: x+y=40
Equation #2: 7x+4y=193
Monica bought 11 red bricks.
Step-by-step explanation:
Given,
Cost of one red brick = $7
Cost of one gray brick = $4
Total spent on bricks = $193
Total bricks bought = 40
Let,
x represents the number of red bricks bought.
y represents the number of gray bricks bought.
What is the system that models this situation?
Equation #1: x+y=40
Equation #2: 7x+4y=193
How many red bricks did Monica purchase?
Multiplying Eqn 1 by 4
Subtracting Eqn 3 from Eqn 2
Dividing both sides by 3
Monica bought 11 red bricks.
Keywords: linear equation, elimination method
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