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AlexFokin [52]
3 years ago
10

Jen wants to buy four books: for $10.00, for

Mathematics
1 answer:
Nitella [24]3 years ago
6 0
20 + (0.4 × 15) + 12 + (0.4 × 10) = 20 + 6 + 12 + 4 = 42

20 + 15 + 12 + 10 = 57

57 - 42 = 15

15 ÷ 57 × 100 = 1500 ÷ 57 = 26.3

Ans = $42.00, 26% off ...
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Answer:

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Step-by-step explanation:

We have a system with two equations, one equation is a quadratic function and the other equation is a linear function.

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Then to resolve a quadratic equation we apply Bhaskara's formula:

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For example:

In the three graphs the pink one is a quadratic function and the green one is a linear function.

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