The students in Ms. Ramirez's science class are classifying different types of reactions. They have divided the reactions into two columns, as shown below. Use the table to answer the questions that follow. Column A Column B
Baking cupcakes Dissolving salt in water
Burning a log Boiling water
Frying an egg Freezing juice
Iron rusting Sawing a board in half
Why are the reactions listed in Column A classified as chemical reactions?
A.
The changes do not affect the materials' characteristics.
B.
The changes to the materials can be easily reversed.
C.
They changed the properties of the materials.
D.
They changed the shape of the materials.

Jasmine is diving off a 3-meter springboard. her height in meters above the water when she is x meters horizontally from the end of the board is approximated by the equation h=-x^2+3x+3. what is the maximum height jasmine will reach on her dive?

In a good thermo flask the main cause of heat loss is

The second largest public utility in the nation is the sole provider of electricity in 32 counties of southern florida. to meet the monthly demand for electricity in these counties, which is given by the inverse demand function p = 1,200 – 4q, the utility company has set up two electric generating facilities: q1 kilowatts are produced at facility 1, and q2 kilowatts are produced at facility 2 (so q = q1 + q2). the costs of producing electricity at each facility are given by c1(q1) = 8,000 + 6q12 and c2(q2) = 6,000 + 3q22, respectively. determine the profit-maximizing amounts of electricity to produce at the two facilities, the optimal price, and the utility company’s profit