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 Test Calculators and Practice Answers archive Word Problems Lessons In Depth

 Question 266414: two trains start from the same station and run in opposite directions. one runs at a uniform rate of 30km an hour and the other runs at 35km an hour. in how many hours will they be 195km apart? Click here to see answer by checkley77(12569)

 Question 266674: the equation of a tangent line to the curve x^2+y^2=169 at the point (5,-12) is? Click here to see answer by drk(1908)

 Question 267313: whats log base 5 exponent y = log base 5 exponent 2y+1 Click here to see answer by Alan3354(30959)

 Question 267380: Given y=x/(x^2+1), use the algebraic tests to determine symmetry with respect to both axes and the origin. Click here to see answer by drk(1908)

 Question 267571: One degree Celsius indicates the same temperature change as A. one degree Fahrenheit. B. one degree kelvin. C. 5/9 degree Fahrenheit. D. 9/5 kelvin. Click here to see answer by Edwin McCravy(8879)

 Question 267617: If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have A. a frequency higher than the original frequency. B. a period higher than the original period. C. an amplitude lower than the original amplitude. D. a pitch lower than the original pitch. Click here to see answer by rfer(12644)
 Question 267617: If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have A. a frequency higher than the original frequency. B. a period higher than the original period. C. an amplitude lower than the original amplitude. D. a pitch lower than the original pitch. Click here to see answer by Alan3354(30959)

 Question 267621: If a string vibrates at the fundamental frequency of 528 Hz and also produces an overtone with a frequency of 1,056 Hz, this overtone is the A. first harmonic. B. second harmonic. C. third harmonic. D. fourth harmonic. Click here to see answer by rfer(12644)

 Question 267636: Which one of the following groups of chemical compounds is composed entirely of organic compounds? A. C2H4O, CH2O, CaSO4, C3H5(OH)3 B. C6H6, C2H5OH, C6H5CH3, C3H5(NO3)3 C. C2H2, CH4, CaCl2, CaCN2 D. Ch3OCH3, Ca3(PO4)2, CO2, H2CO3 Click here to see answer by Alan3354(30959)

 Question 267622: A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes A. three times as low. B. nine times as low. C. three times as high. D. nine times as high. Click here to see answer by Alan3354(30959)

 Question 267609: In a transverse wave that travels through a medium, the molecules of the medium vibrate A. in the direction in which the wave travels. B. at right angles to the direction in which the wave travels. C. at twice the velocity of the molecules in a longitudinal wave. D. with smaller amplitudes than the molecules in a longitudinal wave. Click here to see answer by Alan3354(30959)

 Question 267581: A wave with a period of 0.008 second has a frequency of A. 12.5 Hz. B. 80 Hz. C. 125 Hz. D. 800 Hz. Click here to see answer by ankor@dixie-net.com(15624)

 Question 267958: A chemist wants to mix a 5% acid solution with a 25% acid solution to obtain 50 liters of 20% acid solution. how many liters of each solution should be used? Click here to see answer by ptaylor(2048)

 Question 267998: Which of the following is represented in the highest percentage by volume in dry air? A. Oxygen B. Nitrogen C. Carbon dioxide D. Hydrogen Click here to see answer by Alan3354(30959)

 Question 268007: If water and oil are combined in a container, the resulting liquid is a(n) A. emulsion. B. suspension. C. solution. D. mixture. Click here to see answer by richwmiller(9135)

 Question 268017: In a nuclear reaction, energy is released by the combination of two elements into a new element. This process is an example of A. natural radioactivity. B. artificial disintegration. C. nuclear fusion. D. nuclear fission. Click here to see answer by Alan3354(30959)

 Question 268015: One atom of silicon can properly be combined in a compound with A. one atom of chlorine. B. two atoms of oxygen. C. three atoms of hydrogen. D. four atoms of calcium. Click here to see answer by Alan3354(30959)

 Question 268014: Examine the following unbalanced chemical equation: CO2 + C → CO. Which of the following is the correctly balanced form of this equation? A. 2CO2 + C → CO B. CO2 + C → 2CO C. CO2 + C2 → CO D. CO2 + C → C2O Click here to see answer by Alan3354(30959)

 Question 268016: Which one of the following formulas represents an aldehyde? A. C6H10O5 B. C2H4O C. C2H5OH D. CH3COOH Click here to see answer by vksarvepalli(154)

 Question 268012: The names of the compounds FeS, NaCl, NaOH, and Pb(CN)2 all end in the suffix A. -ide. B. -ite. C. -ic. D. -ate. Click here to see answer by vksarvepalli(154)

 Question 268739: An apple has 24 fewer calories than a banana. If 7 bannans have the same number of calories as 10 apples, how many calories are in a bannana? Click here to see answer by stanbon(57219)

 Question 268807: 2. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together? A. 2 hours and 24 minutes B. 3 hours and 12 minutes C. 3 hours and 44 minutes D. 4 hours and 10 minutes E. 4 hours and 33 minutes Please show me how to solve this problem. Click here to see answer by palanisamy(496)

 Question 269011: y= x^2 sin 1/x (x≠0) (A) 2x sin1/x - x^2 cos1/x (B) -2/x cos1/x (C) 2x cos1/x (D) 2x sin1/x - cos1/x (E) -cos1/x Click here to see answer by Edwin McCravy(8879)

 Question 269190: given log bA=2.435 and log bB=0.343 find log b A/B? choose fro these four answers 1. 2.092 2. 0.835 3. 2.435 4. 2.778 Click here to see answer by scott8148(6628)

 Question 269202: A local hamburger shop sold a combined total of 822 hamburgers and cheeseburgers on Wednesday. There were 72 more cheeseburgers sold than hamburgers. How many hamburgers were sold on Wednesday? Click here to see answer by suhasbhat(3)

 Question 269250: Your cell phone company charges \$30.25 per month plus \$0.05 per text. Your bill this month was \$38.75. How may times did you send a text message? A.17 B.170 C.775 D.1380 Click here to see answer by cornball3440(16)

 Question 269249: Tara earned the following quiz scores in her biology class:92,76,80,83 and 91. What must she get on her next quiz to have an average grade of 85% in the class? A.88 B.3 C.82 Click here to see answer by dabanfield(803)

 Question 269248: The population of Cartown, USA has decreased by 1/4 over the last year due to an auto plant closing. The population now is 58,215. What was the population last year? A.14,554 B.46,572 C.77,620 Click here to see answer by checkley77(12569)

 Question 268697: Diane canned 18 quarts of peaches, 15 quarts of apricots, and 12 quarts of plums. she would like to place the quarts into the greatest number of boxes so that each box has the same number of each kind of fruit. how many boxes does she need? Click here to see answer by ankor@dixie-net.com(15624)

 Question 269313: Solve for the indicated letter. a-7b, for b Click here to see answer by stanbon(57219)

 Question 269312: Find the slope and the y-intercept f(x)= -10x-8 Click here to see answer by stanbon(57219)

 Question 269376: choose the expression or equation that is equivalent to the one given log 4 4 x 1. 4 2. x 3. 4x 4.1 Click here to see answer by nerdybill(6948)

 Question 269419: If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is A. 273°C. B. 327°C. C. 705°C. D. 873°C. Click here to see answer by drk(1908)

 Question 269430: A temperature of 200°F is equivalent to approximately A. 37.8°C. B. 93.3°C. C. 232°C. D. 840°C Click here to see answer by drk(1908)

 Question 269438: If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is A. 0 degrees. B. 40 degrees. C. 80 degrees. D. 90 degrees Click here to see answer by Alan3354(30959)

 Question 269436: A wave with a period of 0.008 second has a frequency of A. 12.5 Hz. B. 80 Hz. C. 125 Hz. D. 800 Hz. Click here to see answer by Alan3354(30959)

 Question 269432: A quantity of gas has a volume of 0.20 cubic meter and an absolute temperature of 333 degrees kelvin. When the temperature of the gas is raised to 533 degrees kelvin, what is the new volume of the gas? (Assume that there's no change in pressure.) A. 0.0006 m3 B. 0.2146 m3 C. 0.2333 m3 D. 0.3198 m3 Click here to see answer by Alan3354(30959)

 Question 269433: What is the length of an aluminum rod at 65°C if its length at 15°C is 1.2 meters? A. 0.001386 meter B. 0.00180 meter C. 1.201386 meters D. 1.214855 meters Click here to see answer by Alan3354(30959)

 Question 269442: The valence of aluminum is +3, and the valence of chlorine is -1. The formula for aluminum chloride is correctly written as A. Al3Cl. B. AlCl3. C. ClAl3. D. Cl3Al. Click here to see answer by drk(1908)

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