# Posts by drew

Total # Posts: 298

**algebra**

f of x = the square root of 2x minus 5 Find f (27) A. 2 B. 3 C. -5 D. 7 D not sure on this stuff, could you explain the steps?

**algebra**

Determine if the inverse of function {(-3, -6), (-1, 2), (1, 2), (3, 6)} is also a function. A. function B. not a function B

**algebra**

f of x = the square root of 2x minus 5 Find f(4.5) A. 2 B. 3 C. -5 D. 7 B

**algebra**

could you explain the steps?

**algebra**

What is the range of the inverse of relation {(1, 7), (2, -4), (5, 6), (2, 8)}? A. {1, 2, 5} B. {-4, 6, 7, 8} C. {1, 5} D. {-4, 7, 8} B

**algebra**

Simplify the rational expression: x−5 /x 2 −x−20 A. x−4 B. x+4 C. x 2 −15 D 1 /x+4 D

**algebra**

Find f o g if f(x) = 2x - 1 and g(x) = x + 2. A. 2x - 3 B. 2x + 1 C. 2x - 1 D. 2x + 3 B

**algebra**

Find f o g if f(x) = x + 7 and g(x) = 3x – 2. A. 3x + 5 B. 3x - 5 C. 3x + 19 D. -3x - 19 D

**algebra**

Find g of f if f(x) = 2x - 1 and g(x) = x + 2. A. 2x - 3 B. 2x + 1 C. 2x - 1 D. 2x + 3 D

**algebra**

Find g o f if f(x) = x + 7 and g(x) = 3x – 2. A. 3x + 5 B. 3x - 5 C. 3x + 19 D. -3x - 19 C

**algebra**

Find f(x)·g(x) if f(x) = 3x and g(x) = x + 1. A. 3x2 + 3x B. 3x + 1 C. 4x + 1 D. 3x2 + 1 D

**algebra**

Find the slope between points (4, 6) and (-2, 6). A. 0 B. Undefined slope C. one fourth D. -4 D

**algebra**

Find f(x)·g(x) if f(x) = 3x and g(x) = x + 1. A. 3x2 + 3x B. 3x + 1 C. 4x + 1 D. 3x2 + 1 A

**algebra**

I got B and C mixed up, I meant to say C B is suppose to be x^2

**algebra**

If f(x) = 2x and g(x) = ½ , calculate f(x) • g(x) A. x B. x2 C. 2x D. 2x2 I say B

**Physics**

A mass m1 = 4.1 kg rests on a frictionless table and connected by a massless string to another mass m2 = 5.9 kg. A force of magnitude F = 32.0 N pulls m1 to the left a distance d = 0.83 m. 1) How much work is done by the force F on the two block system? 2) How much work is ...

**Msth**

CBDAC is 100% correct :-)

**physics**

Calculate the speed of a 10,000 kg airliner with a kinetic energy of 3.1 x 10^9 J.

**physics**

Calculate the speed of a 10,000 kg airliner with a kinetic energy of 3.1 x 10^9 J.

**Math**

37% of college students say they use credit cards because of the rewards program. You randomly select 10 college kids and ask each to name the reason he or she uses credit cards. Find the probability that the number of college students who say they use credit cards because of ...

**chemistry**

whoops D

**chemistry**

solve the following and express your answer in scientific notation: (5.3 x 10^4) + (1.3 x 10^3) A. 5.4 X 10^4 B. 5.4 X 10^8 C. 6.6 X 10^7 D. 6.9 X 10^7 I say c

**chemistry**

got it now B

**chemistry**

one isotope of chromium (atomic number 24) has an atomic mass of 53 amu. how many neutrons are in this particular isotope of chromium? A. 24 B. 29 C. 53 D. 77 I say A

**chemistry**

amphetamine (c9h13n) is a powerful stimulant. what is the percent composition of all of the elements in this compound? A. 9%C;13%H;1%N B. 30%C;10%H;60%N C. 60%C;35$H;5%N D. 80%C;9.6%H;10.4%N I think b

**chemistry**

C. 81.8%

**chemistry**

what is the percent by mass of carbon in c3h8? A. 18.20% B. 20.0% C. 81.8% D. 85.0% I say A

**chemistry**

how many moles are in 243.6 g caco3? A.7.41 mol caco3 B 2.43 mol caco3 C.102.46 mol caco3 D.88.1 mol cao3 I say A

**chemistry**

a compound is found to be 94.1% o and 5.90% h. its molecular mass is 34.0. what is its molecular formula A. H3O2 B. OH C. H2O D. H2O2 I think D

**Physics**

A roller coaster is initially at a height of 40 m above the ground and has an initial velocity of 15 m/s. Using conservation of energy, find the velocity of the roller coaster at a height of 5 m above the ground.

**chemistry**

in the formula for calcium bromide (CaBr2), what does the subscripted two indicate? A. the bromide atom has a charge of 2- B. the bromide atom has a charge of 2+ C. there are two bromide atoms for every calcium atom. D. there are two calcium atoms for every bromide atom I say C.

**chemistry**

what is the formula for the arsenic ion. A. As3- B. As2- C. As, D. As3+ I say c.

**chemistry**

how many electrons does Fe3+ gain or lose when the ion forms? A. gains 1 electron B. loses 1 electron C. gain 3 electrons D. loses 3 electrons I think D.

**chemistry**

the fluoride anion always carries a charge of 1- true or false I say true

**chemistry**

Lithium-6 has an atomic number of 3. How many electrons are in this isotope? A. 0 electrons B. 3 electrons C. 6 electrons D. 9 electrons I think C. 6

**chemistry**

Lithium-6 has an atomic number of 3. How many protons are in this isotope? A. 0 protons B. 3 protons C. 6 protons D. 9 protons I think 3

**chemistry**

boron-10 has an atomic number of 5. how many electrons are in this isotope? 0 electrons, 2 electrons, 5 electrons, 10 electrons. I think 10

**chemistry**

boron-10 has an atomic number of 5. how many neutrons are in this isotope? 0 neutrons, 2 neutrons, 5 neutrons, 10 neutrons. I say 5

**chemistry**

the idea of the atom was first proposed by john dalton. true or false false

**chemistry**

Actinides and Lanthanides are elements in group 3A. true or false I say false

**chemistry**

Lithium-6 has an atomic number of 3. how many neutrons are in this isotope? A. 0 neutrons, B. 3 neutrons, C. 6 neutrons, D. 9 neutrons I say B

**Math for Ms. Sue Or Steve**

Ms Sue, stop it with the insults! That's not cool!

**chemistry**

guessed

**chemistry**

meant A

**chemistry**

What is the molar mass of hydrogen? A. 1.01 g/mol B. 11.01 g/mol C. 101.1 g/mol D. .0111 g/mol D

**chemistry**

How many atoms are in 3.14 mol of methane (CH4)? A. 7.56 x 1023 atoms B. 7.56 x 102 atoms C. 7.56 x 104 atoms D. 7.56 x 1024 atoms D

**chemistry**

What is a problem-solving technique that uses equivalent measurements in ratio form to solve problems? A. Avogadro's number B. Conversion C. Dimensional analysis D. The mole concept A

**chemistry**

In order to determine the number of atoms in a compound, you must know the number of atoms in a representative particle of the compound. True False i think false

**chemistry**

How many moles are in 4.81 x 1024 atoms Na? A. 0.799 mol Na B. 7.99 mol Na C. 481 mol Na D. 7.99 x 10-1 mol Na B

**chemistry**

How many atoms are in 1.14 mol of propane (C3H8)? A. 7.55 x 1023 atoms B. 7.77 x 1024 atoms C. 7.55 x 1024 atoms D. 7.55 x 1030 atoms C

**chemistry**

How many moles of magnesium is 1.25 x 1023 atoms of magnesium? A. 0.208 × 101 mol Mg B. 2.08 × 101 mol Mg C. 2.08 × 10 -1 mol Mg D. 20.8 mol Mg I think it would be D

**chemistry**

What is the gram molecular mass of C2H6? A. 8.0 g B. 30.0 g C. 40.0 g D. 50.0 g think B

**chemistry**

What is the gram fomula mass of calcium carbonate (CaSO4)? A. 6 g B. 136.2 g C. 230.0 g D. 235.4 g think B

**chemistry**

thank you

**chemistry**

The chemical explosive nitroglycerine has the formula C3H5(NO3)3. How many oxygen atoms are in the formula unit for this compound? A. 3 B. 6 C. 9 D. 12 C. 9

**chemistry**

The water molecule (H2O) is composed of 2 atoms of hydrogen and one atom of oxygen. What is the mass of one mole of water? A. 3 g B. 18 g C. 6 g D. 6.02 x 1023 g B. 18 g

**math**

On a cold winter day, the temperature is -10.0º C. What is the reading on the Fahrenheit scale? A. 10.0 oF B. 12.0 oF C. 13.0 oF D. 14.0 oF I say A

**math**

The temperature of the water around a nuclear reactor core is about 300 oC. what is this temperature in degrees Fahrenheit? A. 27 oF B. 332 oF C. 572 of D. 573 oF I say D

**math**

Solve the following and express the answer in scientific notation: (5.4 x 10^4) x (4.5 x 10^8) A. 2.4 x 10^10 B. 24 x 10^11 C. 24 x 10^12 D. 2.4 x 10^3 I say D

**Science**

The "resistant" threshold for gemifloxacin is >1 mg/L while the "resistant" threshold for sulfamethoxazole is >512 mg/L. Explain why there might be this great disparity of values in resistance thresholds (512-fold) for each antibiotic ...

**physics**

thanks, but how come m is not in kg?

**physics**

Just an explanation without numbers would be awesome, i just want to understand the correct steps to take. Thanks!

**physics**

Ice fishing equipment weighing 3,000 N is pulled at a constant speed V = 0.5 m/s across a frozen lake by means of a horizontal rope. If the coefficient of kinetic friction is 0.05, what is the work done (in J) by the fisherman in pulling the equipment a distance of 500 m?

**Chemistry**

got it thanks!

**Chemistry**

Another hour gone by working on this and i still can't figure it out. Im totally lost!

**Chemistry**

A mixture of ethane and ethene occupied 35.5 L at 1.000 bar and 405 K. This mixture reacted completely with 110.3 g of O2 to produce CO2 and H2O. What was the composition of the original mixture? Assume ideal gas behavior Im pretty sure i use dalton's law of partial ...

**Physics**

A tennis ball is thrown horizontally from an elevation of 20.60 m above the ground with a speed of 19.0 m/s. (a) Where is the ball after 2.00 s for the horizontal and vertical position? (b) If the ball is still in the air, how long before it hits the ground? If the ball is ...

**Math**

Fiind the area bounded by the parabola y^2 = 8x, the x axis and the line x=2

**Physics**

a quarter sits at the bottom of a wishing well where the gauge pressure reads 294 kPa. If the quarter has a diameter of 24mm, what is the total force acting on the top surface of the quarter? Note: Atmospheric pressure = 101.3

**Calculas**

square root of 2x

**Calculas**

Find the length of the curve y=ã(2x), from x=1 to x=4.

**chemistry**

Nitrogen-13 has a half-life of 10 minutes. Given a starting mass of 2.00 g of nitrogen-13, how many grams will remain at the end of 30 minutes?

**stat**

.1841

**chemistry**

What is the molarity of the solution produced when 14.1 grams of ammonia is dissolved in sufficient water to prepare .100 liters of solution?

**calculus**

yes, i pretty sure i got it as my answer mathes the back of the book

**calculus,1**

we got a few examples in class but not understanding it at all

**calculus**

Can someone please show steps as I am having a hard time understanding. The position (in meters) of a particle is modeled by y=x^3-12.5x^2+51x-67.5, where xis in seconds. Find the max, min and point(s) of inflection.

**calculus**

This is just for study for exam coming up and says it could be worth up to 12 marks. Not understanding vry well the two

**calculus**

The position (in meters) of a particle is modeled by y=x^3-12.5x^2+51x-67.5, where xis in seconds. Find the max, min and point(s) of inflection.

**calculus**

A balloon is being filled at a rate of 4000 cm^3/min. How fast is the surface area of the ballon increasing when the radius is 125 cm? V=4/3pir^3, SA=4pir^2

**physics**

A certain dog whistle operates at 23.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 9200 Hz occurs when they are played simultaneously, estimate the operating ...

**Physics (Energy and Momentum)**

You are given V and are solving for dM/dt what do you set it equal to?

**physics**

what is the wave equation?

**physics**

FM radio signals are electromagnetic waves transmitted between frequencies of 88 MHz and 107 MHz. Find the range of wavelengths for these signals. largest___m smallest___m

**calculus**

Use Newtons method to find the roots of the equation 1/x=1+x^3

**Algebra 2**

Hi I need help. Can you show me how to solve this problem? Radical Inequalities. -2 + square root 9-5x greater than or equal to 6

**physics**

1.49m

**trig**

Find the other endpoint of the line segment with the given endpoint and mid point. 1. Endpoint:(-1, 9), midpoint: (-9, -10) 2. Endpoint: (2, 5), midpoint: (5, 1) 3. Endpoint:(9, -10), midpoint: (4, 8)

**Math**

Find the discriminant. Tell which conic section the graph will be. 3x^2 + 12 xy + 9y^2 + 7x -2y - 100

**managerial economics**

Qd=15.0-0.2P where Qd is annual quantity demanded in millions of units and P is the wholesale price. Incurred cost of $60 million. Production cost is $5/unit. (1) what is wholesale price, (2) production annually, (3) annual profit? Given this is a monopoly with an expiring ...

**trig**

does sec(x)tan(x)*tan(x)=[sec(x)(tan^2)x]

**chemistry**

what are three common ores from which copper can be extracted

**geometry**

How tall is a tower if it casts a shadow 65 ft long at the same time that a building 160 ft tall casts a shadow 130 ft long?

**Algebra**

How do you solve: (2x+1)(x-4)=0

**Language**

thank you

**Language**

yes

**Language**

3 disadvantages for town crying

**chemistry**

A solution was made by dissolving 10.0g of a nonvolatile nonelectrolyte compound in 100.0g of water froze at -0.93C. What is the approximate molecular weight of the substance. (for water..kf=1.86C/m) (m is molality)

**chemistry**

D=[mol.wt*P)/(R*T) D=(29.0 g/mol*0.97atm)/[(0.0821 atm*L/mol*K)*(303.15 K)] =1.13 g/L

**calculus**

Given f''(x)=5x−6 and f'(−3)=−6 and f(−3)=2. find f'(x) and f(1)