the seventh grade class enrollment went from 80 students to 60 students after summer vacation what was the percent decrease?

Answer:

Step-by-step explanation:

Since,

The volume of a rectangular prism = Base area × Height,

Given,

Volume of the rectangular prism =

Base area = 2x - 4

Let h be the height,

By long division ( shown below ),

Which is the required expression that represents the height.

Answer:

Step-by-step explanation:

We are given the following information in the question:

Volume of rectangular prism =

Area of base of prism =

Formula:

Putting the values we, get,

Hence, the height of the prism is given by the expression

The testtube is cold best describes what is felt.

Option A is the correct answer.

What is a chemical reaction?

A chemicalreaction is a process that leads to the transformation of one set of chemical substances into another.

In other words, it is the process of breaking and forming chemical bonds between atoms to create new compounds with different properties than the original substances.

We have,

An endothermicreaction is a type of chemical reaction that absorbs heat from the surrounding environment, resulting in a decrease in temperature.

In this case,

The chemicalreaction that occurred in the test tube absorbed heat from the surroundings, including the air and the test tube itself.

As a result, the temperature of the test tube decreased, making it feel cold to the touch.

Thus,

The testtube is cold best describes what is felt.

Learn more about the chemicalreaction here:

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Final answer:

In an endothermic reaction, the test tube will feel cold because heat is absorbed by the system from the surroundings.

Explanation:

A chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings. In the course of an endothermic process, the system gains heat from the surroundings, and so the temperature of the surroundings decreases.

The quantity of heat for a process is represented by the letter q. The sign of q for an endothermic process is positive because the system is gaining heat.

A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.

The sign of q for an exothermic process is negative because the system is losing heat.

Learn more about Endothermic reactions here:

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Answer:

4⋅(−9)⋅(−3)⋅(−1) product is negative,

Step-by-step explanation:

Given  : Numbers .

To find : Which product is negative.

Solution : We have given expression with positive sign and negative sign.

By the integer rule : When we multiplied the even number of negative it become positive .

Example: -a * - b = ab.

When we multiplied the odd number of negative it become negative  .

Example: -a * - b* -c = - abc.

This expression have −6⋅(−7)⋅(−8)⋅0 have 3 negative sign but it has 0 so, this expression would be zero.

Then only this 4⋅(−9)⋅(−3)⋅(−1) expression have 3 negative sign

So, its product would be negative.

Therefore, 4⋅(−9)⋅(−3)⋅(−1) product is negative,

The negative answer is the last one, 4⋅(−9)⋅(−3)⋅(−1)

positive times a negative = a negative

negative times a negative= a positive

a positive times a negative= a negative