Say x = the number of items being purchased. Then we can write the equation, using seconds:
3x + 16 = 136
(3 seconds per item, plus 16 seconds to process payment, equals 136 seconds total.)
Subtract 16 from each side. Then divide both sides by 3.
ANSWER:
6
Explanation:
20-2 = 18
1/3 = 0.33333 (3 repeating)
1/3 x 18 = 6
Answer:
B: 4 solutions
Step-by-step explanation:
Combining the two equations results in 2x² = 52, or x² = 26.
This equation has two solutions: x = ±√26.
As before, x² = 26. If we substitute 26 for x² in the 1st equation, we get:
26 - 4y² = 16, or 4y² = 10, or y = ±√5/2. Again: two solutions.
If we take x to be +√26, y could be ±√(5/2).
Check: is ( √26, √(5/2) ) a solution of the system?
Subbing these values into the first equation, we get:
26 - 4(5/2) = 16. Is this true?
Then 10 = 10. Yes.
Through three more checks, we find that this system has FOUR solutions.
The property that is not a justification for the proof is: B. addition property of equality.
<h3>What is the Addition Property of Equality?</h3>
According to the addition property of equality, if a - b = c, then a - b + b = c + b, which is: a = c + b.
In the proof given, there is no single statement that shows that we are adding a figure or variable to both sides of any equation, therefore, the justification that is not part of the proof is: addition property of equality.
Learn more about addition property of equality on:
brainly.com/question/1542520
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