She is wrong. The way we know this is by this. If you are going 70 mph for 30 miles than you have to spilt the mph sign in half so 35 miles in 30 minutes.The you subtract 4 from each getting 31 miles in 26 minuets. Therefore Lethna is wrong.
Answer:
When using the given information in the table, the slope is 2.
Step-by-step explanation:
First, we need to know the formula for finding slope.
Now, we need two points from the table so we can plug them into the formula. Let's use the points (10,14) and (20,34).
Subtract 14 from 34 and subtract 10 from 20.
Now, divide 20 by 10.
So, the slope that represents the table is 2.
Using the elimination method, multiply the first equation by 60 and the second one by 30 (least common denominators)
30x-45y=11...(1)
12x+5y=9...(12)
Multiply the second equation by 9, to eliminate y
30x-45y=11
+ 108x+45y=81
———————-
138x=92
x=92/138 (reduce fraction with 46)
x=2/3
Substitute x=2/3 into equation 2
12(2/3x)+5y=9
y=1/5
Therefore, the solution to the system is C. (2/3, 1,5)
the value of x undefined is 5
The value of P² + Q² + P · Q including elimination of <em>radical</em> denominators is equal to 13.
<h3>How to find the value of a expression including elimination of radical in denominators</h3>
Herein we have two <em>irrational</em> terms whose denominators are <em>radical</em> expressions, which can be treated by algebraic handling and properties for radical expressions:
P = (√2 + 1) / (√2 - 1)
P = [(√2 + 1) / (√2 - 1)] · [(√2 + 1) / (√2 + 1)]
P = (√2 + 1)² / (2 - 1)
P = (√2 + 1)²
P = 2 + 2√2 + 1
P = 3 + 2√2
Q = (√2 - 1) / (√2 + 1)
Q = [(√2 - 1) / (√2 + 1)] · [(√2 - 1) / (√2 - 1)]
Q = (√2 - 1)²
Q = 2 - 2√2 + 1
Q = 3 - 2√2
Then, the value of P² + Q² + P · Q is:
M = (3 + 2√2)² + (3 - 2√2)² + (3 + 2√2) · (3 - 2√2)
M = 9 + 12√2 + 8 + 9 - 12√2 - 8 + 3 - 8
M = 9 + 8 + 9 - 8 + 3 - 8
M = 21 - 8
M = 13
The value of P² + Q² + P · Q including elimination of <em>radical</em> denominators is equal to 13.
<h3>Remark</h3>
The statement is poorly formatted and reports typing mistakes, correct form is presented below:
<em>If P = (√2 + 1) / (√2 - 1) and Q = (√2 - 1) / (√2 + 1), then find P² + Q² + P · Q.</em>
To learn more on radical equations: brainly.com/question/9370639
#SPJ1