• Trig Question Help please?

    Use Pythagoras h^2 = (3 + 2)^2 + ( 4 + 5)^2 h^2 = 5^2 + 9^2 h^2 = 25 + 81 h^2 = 106 h = sqrt(106) h = 10.295630140987000315797369464198 h = 10.3 ft.
    Use Pythagoras h^2 = (3 + 2)^2 + ( 4 + 5)^2 h^2 = 5^2 + 9^2 h^2 = 25 + 81 h^2 = 106 h = sqrt(106) h = 10.295630140987000315797369464198 h = 10.3 ft.
    2 answers · Mathematics · 16 hours ago
  • Whats one third of 2000?

    2000/3 = 666. 2/3 or 666.6666.....
    2000/3 = 666. 2/3 or 666.6666.....
    5 answers · Mathematics · 18 hours ago
  • Need math help with finding inverse of a function?

    Let y= f(x) Hennce y = -3(x - 4)^2 + 2 y - 2 = -3(x - 4)^2 (y - 2) / -3 = (x - 4)^2 Sqrt both sides sqrt((y - 2)/-3)) = x - 4 4 +/- sqrt[(y - 2) / -3] = x 'Swop' the letters y = 4 +/- sqrt((x - 2)/(-3)) f^-1(x) = 4 +/- sqrt((x - 2)/(-3))
    Let y= f(x) Hennce y = -3(x - 4)^2 + 2 y - 2 = -3(x - 4)^2 (y - 2) / -3 = (x - 4)^2 Sqrt both sides sqrt((y - 2)/-3)) = x - 4 4 +/- sqrt[(y - 2) / -3] = x 'Swop' the letters y = 4 +/- sqrt((x - 2)/(-3)) f^-1(x) = 4 +/- sqrt((x - 2)/(-3))
    4 answers · Mathematics · 23 hours ago
  • Given that sinX + Cos X=0, show that tan X= -1?

    SinX + CosX = 0 SinX = -CosX SinX / CosX = -1 tanX = -1
    SinX + CosX = 0 SinX = -CosX SinX / CosX = -1 tanX = -1
    6 answers · Mathematics · 2 days ago
  • Given that 3+sin^2(X) / cos(x) - 2 = 3cos(X) show that cos (X) = -1/2?

    3 + (1 - Cos^2(X)) / Cos(X) - 2 = 3CosX 3CosX + 1 - Cos^2(X) - 2Cos(X) = 3Cos(X) 1 - Cos^2(X) - 2Cos(X) = 0 Cos^2(X) + 2Cos(X) - 1 = 0 (Cos(X) + 1)^2 - (1)^2 = 1 (Cos(X) + 1)^2 = 2 Cos(X) + 1 = +/- sqrt(2) Cos(X) = - 1 +/- sqrt(2)
    3 + (1 - Cos^2(X)) / Cos(X) - 2 = 3CosX 3CosX + 1 - Cos^2(X) - 2Cos(X) = 3Cos(X) 1 - Cos^2(X) - 2Cos(X) = 0 Cos^2(X) + 2Cos(X) - 1 = 0 (Cos(X) + 1)^2 - (1)^2 = 1 (Cos(X) + 1)^2 = 2 Cos(X) + 1 = +/- sqrt(2) Cos(X) = - 1 +/- sqrt(2)
    4 answers · Mathematics · 2 days ago
  • Please teach me how to do this. Math hw help complete the following table using exact values. Do not rationalize any denominators.?

    Sec (0) = 1 Sec(30) = 2/sqrt(30) = 2sqrt(3) / 3 Sec(45) = sqrt(2) Sec(60) = 2 Sec(90) = 1/0 = undefined.
    Sec (0) = 1 Sec(30) = 2/sqrt(30) = 2sqrt(3) / 3 Sec(45) = sqrt(2) Sec(60) = 2 Sec(90) = 1/0 = undefined.
    3 answers · Mathematics · 2 days ago
  • What type of chemical reaction will occur if caustic soda is added to vinegar ?

    Neutralisation Caustic Soda is Sodium Hydroxide (NaOH) Vinegaar is a solution of Ethanoic (Acetic)Acid (CH3COOH) Hence the reaction equation is NaOH + CH3COOH = H2O + CH3COONa The products are water and sodium ethanoate(acetate)
    Neutralisation Caustic Soda is Sodium Hydroxide (NaOH) Vinegaar is a solution of Ethanoic (Acetic)Acid (CH3COOH) Hence the reaction equation is NaOH + CH3COOH = H2O + CH3COONa The products are water and sodium ethanoate(acetate)
    3 answers · Chemistry · 4 days ago
  • 15=x^2+4x?

    x^2 + 4x - 15 = 0 This will not factor , so use 'Completing the Square'. x^2 + 4x = 15 (x + 2)^2 - (2)^2 = 15 (x + 2)^2 = 15 + 4 = 19 (x + 2 )^2 = 19 x + 2 = +/-sqrt(19) x = -2 +/- sqrt(19)
    x^2 + 4x - 15 = 0 This will not factor , so use 'Completing the Square'. x^2 + 4x = 15 (x + 2)^2 - (2)^2 = 15 (x + 2)^2 = 15 + 4 = 19 (x + 2 )^2 = 19 x + 2 = +/-sqrt(19) x = -2 +/- sqrt(19)
    3 answers · Mathematics · 4 days ago
  • Give the Atom and Three ions?

    The atom is Argon (At) The three possible ions are Chloride (Cl^-) , Sulphide (S^2-) & Phosphide (P^3-) Each of these three ions has the same electronic configuration as Argon. because each atom has gained an electron(s) to assume the complete octet structure of Argon.
    The atom is Argon (At) The three possible ions are Chloride (Cl^-) , Sulphide (S^2-) & Phosphide (P^3-) Each of these three ions has the same electronic configuration as Argon. because each atom has gained an electron(s) to assume the complete octet structure of Argon.
    3 answers · Chemistry · 4 days ago
  • What is the 2 refering to in trans 2 butene?

    The position in the carbon chain where the alkene double bond starts. H- C(1)H3 -C(2)=C-(3)- C(4)H3 - H For convenience I have labelled in brackets the carbon numbers in the chain . NB You always start with the lowest number.
    The position in the carbon chain where the alkene double bond starts. H- C(1)H3 -C(2)=C-(3)- C(4)H3 - H For convenience I have labelled in brackets the carbon numbers in the chain . NB You always start with the lowest number.
    3 answers · Chemistry · 4 days ago
  • In the Energy Interaction Model, why is there never a Δ in front of Q (heat)?

    The 'Delta' sign refers to the 'DIFFERENCE' in heat between two species. Delta / D / Difference ; It is from Classical Greek alphabet.
    The 'Delta' sign refers to the 'DIFFERENCE' in heat between two species. Delta / D / Difference ; It is from Classical Greek alphabet.
    2 answers · Chemistry · 4 days ago
  • If you started with 15 moles of CH4, to start with, how many moles of H2O would be produced? Usingbalanced equation CH4+ 2O2 -> CO2+ 2H2O?

    CH4 + 2O2 = CO2 + 2H2O Notice the molar ratios are 1:2::1:2 Hence by equivalence 15 : 30 : 15 : 30 Hence '30' moles of water are produced.
    CH4 + 2O2 = CO2 + 2H2O Notice the molar ratios are 1:2::1:2 Hence by equivalence 15 : 30 : 15 : 30 Hence '30' moles of water are produced.
    4 answers · Chemistry · 4 days ago
  • Balance the following equation: ___CH4+___O2 -> ___CO2+_____H2O?

    CH4 + 2O2 = CO2 + 2H2O
    CH4 + 2O2 = CO2 + 2H2O
    5 answers · Chemistry · 4 days ago
  • Chemistry density problem!?

    volume of the rock is 17 - 11.3 = 5.7 mL Density = mass / volume Density = 12.1 / 5.7 = 2.1228 g /mL
    volume of the rock is 17 - 11.3 = 5.7 mL Density = mass / volume Density = 12.1 / 5.7 = 2.1228 g /mL
    2 answers · Chemistry · 4 days ago
  • What do you think of the name Regina for a girl?

    'The word 'Regina' is Latin for 'Queen'. So on a girl its fine!!!!
    'The word 'Regina' is Latin for 'Queen'. So on a girl its fine!!!!
    34 answers · Baby Names · 5 days ago
  • What do you think of the name Riley Sophia for a girl?

    'Riley' ; NO!!! It is an Irish surname Sophia ; YES!!! It means wise.
    'Riley' ; NO!!! It is an Irish surname Sophia ; YES!!! It means wise.
    20 answers · Baby Names · 5 days ago
  • Chemistry Molarity Question!?

    Remember the two 'moles' equations. moles = mass / Mr & moles = [conc] x vol / 1000 Equating mass/Mr = [conc] x vol / 1000 mass = Mr x [conc] x vol / 1000 For 'a' mass = (58.5) x 0.2 x 125 / 1000 mass = 1.4625 g Similarly for 'b' mass = (72 + 12 + 96) x 0.36 x 250 / 1000 mass = 180 x 0.36 x 250 / 1000 mass =... show more
    Remember the two 'moles' equations. moles = mass / Mr & moles = [conc] x vol / 1000 Equating mass/Mr = [conc] x vol / 1000 mass = Mr x [conc] x vol / 1000 For 'a' mass = (58.5) x 0.2 x 125 / 1000 mass = 1.4625 g Similarly for 'b' mass = (72 + 12 + 96) x 0.36 x 250 / 1000 mass = 180 x 0.36 x 250 / 1000 mass = 16.2 g NB the '1000' is used to convert 'mL' to 'dm^3'.
    2 answers · Chemistry · 6 days ago
  • 3x-3 = xy -y and x is not equal to 1 what is the value of y?

    3/x^3 = y(x - 1) y = 3/(x^3(x - 1)) y = 3/(x^4 - x)
    3/x^3 = y(x - 1) y = 3/(x^3(x - 1)) y = 3/(x^4 - x)
    5 answers · Mathematics · 6 days ago
  • Why was a water bath is used to heat naphthalene?

    Because if a burning flame is used, it is likely to ignite the naphthalene.
    Because if a burning flame is used, it is likely to ignite the naphthalene.
    3 answers · Chemistry · 6 days ago
  • The headlights of an automobile are set such that the beam drops 3 in for each 23 ft in front of the car.?

    23ft = 12 x 23 = 276 ins. Tan (Angle) = 3/276 Tan(Ang;e) = 0.01086... Angle = Tan^-1(0.01086...) Angle = 0.62275 ... degrees. (Just slightly more than one half a degree).
    23ft = 12 x 23 = 276 ins. Tan (Angle) = 3/276 Tan(Ang;e) = 0.01086... Angle = Tan^-1(0.01086...) Angle = 0.62275 ... degrees. (Just slightly more than one half a degree).
    4 answers · Physics · 7 days ago