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3 years ago

Please help!! Need soon

Mathematics

1 answer:

bogdanovich [222]3 years ago

6 0

Answer:

86 minutes

If you want a step by step explanation please let me know in the comments .

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X-3 and x-1/3 are factors of ax^2+5x+b,show that a=-3/2

gladu [14]

Hello,

$ax^2+5x+b=a(x^2+ \frac{5}{a}*x+ \frac{b}{a})\\
=k(x-3)(x- \frac{1}{3})\\
=k(x^2-3x- \frac{1}{3}*x+1)\\
=k(x^2- \frac{10}{3}*x+1)\\

x^2--\ \textgreater \ k=a\\
x--\ \textgreater \ 5=-a* \frac{10}{3} ==\ \textgreater \ a=- \frac{3}{2} \\

x^0--\ \textgreater \ b=a$

8 0

3 years ago

According to the WHO report, girls who are one month old have a mean head circumference of 36.6 centimeters with a standard devi

aniked [119]

Answer:

0.0228 = 2.28% probability that a one-month old girl will be categorized as having microcephaly

Step-by-step explanation:

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Medscape defines microcephaly (small head syndrome) as a head circumference that is more than two standard deviations below the mean. What is the probability that a one-month old girl will be categorized as having microcephaly?

Probability of a z-score of -2 or less, which is the p-value of Z = -2.

Looking at the z-table, Z = -2 has a p-value of 0.0228.

0.0228 = 2.28% probability that a one-month old girl will be categorized as having microcephaly

6 0

3 years ago

Need help solving!! QUICKLY!!

Ahat [919]

SA = 1/2 lp + B for l

SA - B = 1/2 lp

2SA - 2B = lp

l = (2SA - 2B) / p

l = 2(SA - B) / p

6 0

3 years ago

Find the area of the four walls of a cubical room whose side measures 5m. Find the cost of white washing the room at the rate of

NikAS [45]

We know that one wall side is 5m.
To find the area of one wall, we do 5²=25m²
We know there is 4 walls. So we have to find total area of all four walls.
Which is 25×4=100m²
To find the total cost of white washing the room, we have to do:
100(total area)×23(cost per m²)=$2300
So the total cost of the area is $2300

7 0

3 years ago

if 2/3 of the girls in class have brown eyes and 1/4 of the girls have blue eyes, what fraction of the girls in class have neith

umka2103 [35]

2/3 = 8/12
1/4 = 3/12
hence fraction of girls with neither blue or black eyes = 1 - 8/12 -3/12 = 1/12

8 0

3 years ago

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