2d

#### Consider the following reaction.

2Fe2O3(s)+3C(s)heat−−→4Fe(s)+3CO2(g)Calculate the number of grams of Fe2O3 needed to react with 20.0 g C.

2d

#### Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO3(s).

The equation for the reaction is2KClO3⟶2KCl+3O2Calculate how many grams of O2(g) can be produced from heating 19.1 g KClO3(s).

2d

#### Consider the combustion reaction for octane (C8H18) , which is a primary component of gasoline.

2C8H18+25O2⟶16CO2+18H2OHow many moles of CO2 are emitted into the atmosphere when 19.6 g C8H18 is burned?

2d

#### How do you get All Four Points on your English SAT?

How do you get All Four Points on your English SAT?

#### EXPECTED VALUE GAMBLING WHEEL QUESTION

Suppose you bet $1 on red at the roulette wheel. There are 18 red numbers and 20 nonred numbers (including the green 0 and 00). You win $1 if a red number comes up, and you lose $1 if any other...
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2d

#### trig need help, with one last equation in my problem

If sinx=49, x in quadrant I, then find (without finding x)sin(2x)= 2(4/9)(sqrt(65)/9)cos(2x)= 1-2(4/9)^2tan(2x) = ?

#### A projectile is shot upward from the surface of Earth with initial velocity of 116 meters per second. Use the position function below. What is its velocity after 2 seconds? After 10 seconds?

s(t) = −4.9t2 + v0t + s02s:____m/s10s:___m/s

#### Find the average rate of change of the function over the given interval.

f(t) = 4t2 − 5, [3, 3.1]Compare this average rate of change with the instantaneous rates of change at the endpoints of the interval.left endpoint:right endpoint:

#### Find k such that the line is tangent to the graph of the function.

Function: f(x)= kx
Line: y=4x+4

2d

#### Find the probability

There are 25 red marbles, 15 green marbles, and 10 blue marbles.You randomly pick 4 from the bag.What is the probability of picking at least 1 marble of each color?

2d

#### Geometry Homework

Important!With the following points: E(-3,5),F(6,2),G(4,-4), H(-5,-1)Find the perimeter and area of rectangle EFGH.

2d

#### Angle measurements

Complimentary Angles= 90 degreesSupplementary Angles= 180Congruent Angles= both measure the sameVertical Angles= ?Adjacent Angles= ?Could you please answer my question marks?

2d

#### find the missing number to complete the porportion

4 apartments on 1 floor=_______ Apartments on 5 floors

2d

#### (solve a system of equations)

There are 26 students in Mrs.Anderson's class. there are two more boys than girls. How many of each are in Mrs.Anderson's class

#### How long till the ball reaches its highest point

An elementary student kicks a ball straight into the air with a velocity of 16 feet/sec. If acceleration due to gravity is -32 ft/sec2, how many seconds after it leaves his foot will it take the...
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#### Find the displacement

For an object whose velocity in ft/sec is given by v(t) = -t2 + 4, what is its displacement, in feet, on the interval t = 0 to t = 3 secs?Question...
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#### Find the distance

Find the distance, in feet, a particle travels in its first 4 seconds of travel, if it moves according to the velocity equation v(t)= -t2 + 4 (in feet/sec). Question...
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