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Sonbull [250]
2 years ago
15

Jack saved 2 pennies today. If he doubles the number of pennies he saves every day, how many more days will it take until he has

saved more than a 1000 pennies?
Mathematics
1 answer:
slavikrds [6]2 years ago
3 0

Answer:

> 499 days

Step-by-step explanation:

The unknown here is the number of days it will take to save over 1000 pennies.  Instead of an equation this is an inequality.  The phrase "more than 1000 pennies" is > 1000.  Now we need to figure out WHAT is more than 1000.  If Jack starts with 2 pennies today, that is our "fixed" number.  To that starting number of pennies we are doubling the number of pennies per day.  Doubling means we are multiplying by 2.  The mathematical expression for "doubling the number of pennies per day" is 2x.  Adding in our starting amount of 2 pennies, we have

2x + 2 > 1000 and

2x > 998 so

x > 499

This means that it will take more than 499 days to get more than 1000 pennies.  It will take 500 days to get exactly 1000, but that is not what we are asked to find.

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The approximate solution of the above equation is: 55/15 (Option A). This is solved using the quartic formula, not quadratic equation.

<h3>What is the Quartic Formula?</h3>

The quartic formula has up to four various solutions including real and imaginary numbers. Read on for more explanation.

<h3>What is the solution to the above question?</h3>

First we restate the above equation:

x²-3x+2= √(x-2) + 2

Next we remove square roots

x^{4} - 6x³ + 9x² = x - 2

Add two to both sides

→ x^{4} - 6x³ + 9x²+2 = x - 2 +2

→  x^{4} - 6x³ + 9x²+2 = x

Subtract X from both sides

→  x^{4} - 6x³ + 9x²+2 -x = x -x

→  x^{4} - 6x³ + 9x²+2 - x= 0

Using the Quartic formula to solve the fourth order equation:
ax^{4} + bx³ + cx² + dx + e

The resolution of x is given as:

x = 2.691085, 3.346753

Because the fraction nearest to 3.4 is 55/16

hence, the correct answer is Option A.

Learn more about quadratic equations at;
brainly.com/question/25841119
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