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AfilCa [17]
3 years ago
12

Please help me, im about to cry cause im so confused. Please explain this to me

Mathematics
1 answer:
eduard3 years ago
6 0

\bold{2.5y=5x-5   }

\bold{y=\dfrac{5x-5}{2.5}   }

\bold{y=\dfrac{2.5(2x-2)}{2.5}   }

\bold{y=\dfrac{\cancel{2.5}(2x-2)}{\cancel{2.5}}   }

\bold{ y=2x-2  }

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Please help
Varvara68 [4.7K]

Answer:

$6 = cost of small box

$8 = cost of large box

Step-by-step explanation:

Let s = cost of small box

     l  = cost of large box

(1)    12s + 3l = 96            (2)     6s + 6l = 84

    Multiply by -2                    <u> -24s - 6l = -192</u>

                                                -18s   = - 108

                                                     s = $6 = cost of small box

      12(6) + 3l = 96

         72 + 3l = 96

                 3l = 24

                   l = $8 = cost of large box

7 0
2 years ago
Birth weights of babies born to full-term pregnancies follow roughly a Normal distribution. At Meadowbrook Hospital, the mean we
Marina86 [1]

Answer:

Required Probability = 0.1283 .

Step-by-step explanation:

We are given that at Meadow brook Hospital, the mean weight of babies born to full-term pregnancies is 7 lbs with a standard deviation of 14 oz.

Firstly, standard deviation in lbs = 14 ÷ 16 = 0.875 lbs.

Also, Birth weights of babies born to full-term pregnancies follow roughly a Normal distribution.

Let X = mean weight of the babies, so X ~ N(\mu = 7 lbs , \sigma^{2}  = 0.875^{2}  lbs)

The standard normal z distribution is given by;

              Z = \frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } } ~ N(0,1)

where, X bar = sample mean weight

             n = sample size = 4

Now, probability that the average weight of the four babies will be more than 7.5 lbs = P(X bar > 7.5 lbs)

P(X bar > 7.5) = P( \frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } } > \frac{7.5-7}{\frac{0.875}{\sqrt{4} } }  ) = P(Z > 1.1428) = 0.1283 (using z% table)

Therefore, the probability that the average weight of the four babies will be more than 7.5 lbs is 0.1283 .

8 0
3 years ago
Multiply the polynomials.
Nonamiya [84]

Answer:

The answer to your question is: letter A

Step-by-step explanation:

      (x + 3) (3x² + 8x + 9) = 3x³  + 8x² + 9x + 9x² + 24x + 27

                                       = 3x³ + 17x² + 33x + 27              Simplify like terms      

Α. 3x3 + 17x2 + 33x + 27

Β. 3x3 + 17x2 – 15x + 27

C. 3x2 + x2 + 33x+ 27

D. 3x3 + 17x2 + 33x - 27

​

7 0
3 years ago
A triangular prism with an equilateral triangle as its base has a volume of 64.98 cubic centimeters, a base area of 10.83 square
Zarrin [17]

Answer:

200

Step-by-step explanation:

8 0
2 years ago
If A/B and C/D are rational expressions, then which of the following is true?
Aleonysh [2.5K]

Answer:

B.

Step-by-step explanation:

A/B × D/C = A/B × D/C because when we divide a fractional number we need to turn the second expression upside down .

6 0
3 years ago
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