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A group of coworkers decided to buy their borsa

$400 birthday gift and to split the cost equally among

themselves. When three of the conorkes decided not

to contribute, those remaining still divided the $400-

birthday gift equally, but each coworket's share of the

cost increased by $30. How many coworkers were in

the group originally?

The song will be sung by the Girls.

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Answer:

C.

Explanation:

It states at least 1500. Eliminating B and D due top the fact that they have or less. To have the 1500 or more you must have x+y+z be more than 15. So it would make the answer C.

Answer:

A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.

Explanation:

Examples of physical change include changes in the size or shape of matter.  Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds. Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances. In general a physical change is reversible using physical means. For example, salt dissolved in water can be recovered by allowing the water to evaporate.A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.An example of a physical change is the process of tempering steel to form a knife blade. A steel blank is repeatedly heated and hammered which changes the hardness of the steel, its flexibility and its ability to maintain a sharp edge.Many physical changes also involve the rearrangement of atoms most noticeably in the formation of crystals. Many chemical changes are irreversible, and many physical changes are reversible, but reversibility is not a certain criterion for classification. Although chemical changes may be recognized by an indication such as odor, color change, or production of a gas, every one of these indicators can result from physical change.

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