Jessica Maths

Most popular questions and responses by Jessica Maths
  1. Pre Calculus

    Find the exact value ofcos (u+v) given that sin u= 7/25 and cos v=−12/13. (Both u and v are in Quadrant II.)

    asked on July 11, 2016
  2. Pre Calculus

    The population P of a culture of bacteria is described by the equation P = 1600e^0.052t where t is time, in hours, relative to the time at which the population was 1600. (a) What was the population at t = 6 hours? Show your work. (b) After how many hours

    asked on July 6, 2016
  3. Pre Calculus

    Evaluate the function f(x) = log3 x at x =1/27 without using a calculator a. –4 b. –2 c. 1/27 d. –3 e. 27

    asked on July 5, 2016
  4. Pre Calculus

    Tritium, a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 69 grams, how much will remain after 75 years? a. 1.5848 grams b. 61.5289 grams c. 0.0000 grams d. 1.0426 grams e. 17.2500 grams

    asked on July 6, 2016
  5. Pre Calculus

    Find the value of x. log4 65,536 = x a. x = 32,768 b. x=8 c. x = 65,536 d. x=4

    asked on July 6, 2016
  6. Pre Calculus

    Determine the quadrant in which an angle, θ, lies if θ = 5.40 radians. a. 4th quadrant b. 3rd quadrant c. 2nd quadrant d. 1st quadrant

    asked on July 10, 2016
  7. Pre Calculus

    Assume that x, y, and b are positive numbers. Use the properties of logarithms to write the expression logb ^8xy in terms of the logarithms of x and y. a. logb^8 + logb x + logb^y b. logb^8+logbx c. logb^8+logby d. logb^8 + log8 x + log8^y e. logb^8+log8xy

    asked on July 6, 2016
  8. Pre Calculus

    Determine two coterminal angles (one positive and one negative) for θ = −503°. a. 217°,− 323° b. 217°, − 143° c. 307°, − 413° d. 127°, − 323° e. 127°, − 233°

    asked on July 10, 2016
  9. Pre Calculus

    17. population growing at an annual rate r will triple in a time t given by the formula t = ln 3/r If the growth rate remains constant and equals 9% per year, how long will it take the population of the town to triple? a. 6 . 6 years b. 1 years c. 5 . 3

    asked on July 6, 2016
  10. Pre Calculus

    Simplify the expression. log3 36 a. 6 b. 36 c. 3 d. 18 e. none of these

    asked on July 6, 2016
  11. Pre Calculus

    Simplify the expression. 9 log 9 2 This is 9 to the power of log base 9 of 2 a. 2 b. 18 c. 4 d. 9 e. none of these

    asked on July 6, 2016
  12. Pre Calculus

    Write the equation 5^2= 25 in logarithmic form. a. log255=2 b. log25=25 c. log52=25 d. log225=5 e. log525=2

    asked on July 6, 2016
  13. Pre Calculus

    Perform the operation shown below and leave the result in trigonometric form. [8(cos10° + i sin10°)] [5(cos 200° + i sin 200°)]

    asked on July 13, 2016
  14. Pre Calculus

    Multiply; then use fundamental identities to simplify the expression below and determine which of the following is not equivalent. (sin x + cos x) ^2 a. 1+2sinxcosx b. sec^2x−tan^2x+2cosxsinx c.sec x + 2 sin x/sec x d. sin^2x+cos^2x e. 1+2cos (pi / 2 -

    asked on July 11, 2016
  15. Pre Calculus

    16. Use a calculator to find a value for ln16.1 to four decimal places. a. 2.7788 b. –2.7788 c. –1.2068 d. 5.0814 e. 1.2068

    asked on July 6, 2016
  16. Pre Calculus

    Assume that x, y, and a are positive numbers. Use the properties of logarithms to write the expression log a 9 xy in terms of the logarithms of x and y. a. 9logbx+9logby b. 19 l o g b ( x + y ) c. 19 l o g b x + l o g b y d. logbx+logby e. 19 l o g b x +

    asked on July 5, 2016
  17. pre calculus

    Use the half-angle formula to simplify the given expression. squareroot 1+cos12x/2

    asked on July 11, 2016
  18. Pre Calculus

    Use the sum-to-product formulas to find the exact value of the given expression. sin 150° + sin 30°

    asked on July 11, 2016
  19. Pre Calculus

    Use a calculator to find the value for log0.94769 to four decimal places. a. –0.0536 b. –0.9767 c. 0.9767 d. 0.0232 e. –0.0232

    asked on July 6, 2016
  20. Pre Calculus

    Assume that x, y and a are positive numbers. Use the properties of logarithms to write the expression loga x ^6y ^7 in terms of the logarithms of x and y. a. 42loga^x+y b. 42loga^x+7loga^y c. 6loga^ x + 42loga^ y d. 6loga^x+7loga^y e. 6loga^x+6loga^y

    asked on July 6, 2016
  21. Pre Calculus

    22. Solve the equation. 2x = 5 a. x = 0.5541 b. x = 5.8628 c. x = 2.3219 d. x = 1.4307 e. x = 1.6652

    asked on July 6, 2016
  22. Pre Calculus

    Identify the x-intercept of the function f(x) = 2 ln(x-3). a. x=3 b. x=0 c. x=2 d. x=4 e. The function has no x-intercept

    asked on July 5, 2016
  23. Pre Calculus

    Can you give me an example of properties of functions in a real life example?

    asked on July 4, 2016
  24. Pre Calculus

    Write f(x) =x^3-11x^2+18x+32 in the form f(x)= (x-k) q (x) +r when k=6 + (square root)6, and demonstrate that !@#$%^&)=r

    asked on July 4, 2016
  25. Pre Calculus

    a. Identify the horizontal asymptotes of the function f(x)=x+6 / |x|+1 ( / = divided by/over) b. Make a summary of how you may sketch a graph of this rational function.

    asked on July 4, 2016
  1. math

    I guess that's what they did too as I had the same question and made the same mistake

    posted on July 11, 2016
  2. math

    sorry I did 7+1

    posted on July 11, 2016
  3. Pre Calculus

    so I got cos(u+v)=204/325 is this correct?

    posted on July 11, 2016
  4. pre calculus

    is it cos12x?

    posted on July 11, 2016
  5. Pre Calculus

    Sorry, I have figured out this one but cannot figure out this one Use the sum-to-product formulas to write the given expression as a product. sin 4θ − sin 2θ Could you help me with this one instead please?

    posted on July 11, 2016
  6. AP Chemistry

    DrBob222 please could you help me with this? Can you explain to me how to answer it?

    posted on July 7, 2016
  7. AP Chemistry

    I think that the reaction is spontaneous because no outside force is required for it to take place. Is this correct? I'm not sure about the other two parts to the question. Can you help me?

    posted on July 7, 2016
  8. Pre Calculus

    No I'm just not sure how to enter that into my calculator

    posted on July 6, 2016