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3 years ago

Which key on the scientific calculator will you need to simplify exponential expressions

Mathematics

2 answers:

mariarad [96]3 years ago

4 0

Answer:

^ key raising the power to a number or variable.

Step-by-step explanation:

We have to tell the key on the scientific calculator needed to simplify exponential expressions.

Exponent is meant as raising the power.

In scientific calculator the key is used which is used to raise the power which is ^.

^ key raising the power to a number or variable.

lapo4ka [179]3 years ago

3 0

It is called a "carrot" in most teachers math vocabulary, Type in your base, then click the ^ button, then type in your exponent.

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3 years ago

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---------

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3 years ago

Brianna has x nickels and y pennies. She has no less than 20 coins worth no more

Bond [772]

Answer:

$y \ge 20 - x$

$y \le 80 -5x$

$(x,y) = (15,5)$

Step-by-step explanation:

Given

$Nickels = x$

$Pennies = y$

$Amount = \$0.80$ maximum

$Coins = 20$ minimum

Required

Solve graphically

First, we need to determine the inequalities of the system.

For number of coins, we have:

$x\ +\ y\ge 20$ because the number of coins is not less than 20

For the worth of coins, we have:

$0.05x\ +\ 0.01y\ \le0.80$ because the worth of coins is not more than 0.80

So, we have the following equations:

$x\ +\ y\ge 20$

$0.05x\ +\ 0.01y\ \le0.80$

Make y the subject in both cases:

$y \ge 20 - x$

$0.01y \le 0.80 - 0.05x$

Divide through by 0.01

$\frac{0.01y}{0.01} \le \frac{0.80}{0.01} -\frac{ 0.05x}{0.01}$

$y \le \frac{0.80}{0.01} -\frac{ 0.05x}{0.01}$

$y \le 80 -5x$

The resulting inequalities are:

$y \ge 20 - x$

$y \le 80 -5x$

The two inequalities are plotted on the graph as shown in the attachment.

$y \ge 20 - x$ --- Blue

$y \ge 80 -5x$ --- Green

Point A on the attachment are possible solutions

At A:

$(x,y) = (15,5)$

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3 years ago