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If z varies jointly as x and the square of y find the percentage change in z if x is increased by 40% and y is decreased by 20%

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  • Réponse publiée par: reyquicoy4321

    let's start by listing all the givens.

    total distance is 420 miles.

    slower train goes at 45 mph

    faster train goes at 60 mph.

    the formula for distance is d=rt.

    the faster train's rate is 60 mph. we don't know how much distance that train will cover, therefore, we should give it a variable, such as d (any letter)the slower train's rate is 45 mph. obviously, it will cover much less distance than the faster train. so we can write it as 420 - d (the variable here should match the one above.we don't know the time it will consume for both of the trains so we can give it a variable like t.

    let's look at the given for the faster train. d (distance, unknown), 60 (rate), and t (time, unknown). using the formula d=rt. we can substitute 60 to the rate to make it d=60t. sure you might not able to solve it at hindsight, but we could substitute it to the slower train's equation.

    now, the equation for the slower train is 420 - d = 45t (420 - d is the distance, 45 is the rate, and t is the time.)

    substute 60t to d: 420 - 60t = 45tbring 60t to the other side by means of adding 60t to both sides: 420 - 60t+(60t) = 45t+(60t) ==> 420t=105tdivide 105 to both sides to isolate t: \frac{450}{105} = \frac{105t}{105}4 = t

    so if t = 4, it means the trains must travel 4 hours (because of miles per hour) before they meet




  • Réponse publiée par: tayis
    1. business loan
    2. personal loan or multi-purpose loan
  • Réponse publiée par: 20201947
    Sa kagubatan po kasi naninirahan ang mga hayop na siya din ang dahilan ng balanse sa ating mundo. at ang mga hayop din ay ginagawa nating pagkain. ang mga puno sa kagubatan ay tumutulong upang maiwasan ang pagguho ng mga lupa at para mabawasan ang init na dulot ng climate change. nakatutulong din ito para hindi masyadong lumaganap ang baha sa iba't ibang lungsod sa ating bansa. yun lang po ang naisip ko ehh. 
  • Réponse publiée par: taekookislifeu
    The product of the binomial is the answer in the addition in binomial
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If z varies jointly as x and the square of y find the percentage change in z if x is increased by 40...