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igomit [66]
3 years ago
12

The expression 100−2.5x represents the balance of Grace’s lunch account after x days. The expression 100+2.5(5−x) represents the

balance of Tim’s lunch account after x days. After how many days do the lunch accounts have the same balance?
Mathematics
1 answer:
Mars2501 [29]3 years ago
8 0

Answer:

Step-by-step explanation:

That means that the given expressions are equal.

100 - 2.5x = 100 + 2.5(5 - x)

100 - 2.5x = 100 + 12.5 - 2.5x

There is no solution to this.

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Hi there!

When we have an equation standard form...
a {x}^{2} + bx + c = 0
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D = b^2 - 4ac

When
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1.) Find the value of the discriminant and the the number of real solutions of
x^2-8x+7=0

Plug in the values from the equation into the formula of the discriminant

( - 8) {}^{2} - 4 \times 1 \times 7 = 64 - 28 = 36

D > 0 and therefore we have two real solutions.

2.) Find the value of the discriminant and the number of real solutions of
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Again, plug in the values from the equation into the formula of the discriminant.

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~ Hope this helps you.
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Answer:

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<span><span>
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