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3 years ago

Please please please help me with this answer

Mathematics

1 answer:

maksim [4K]3 years ago

6 0

if the girls are "g" and the boys are "b"

g + b = 13

b = g + 7 <--- 7 more boys than girls

$\bf g+\boxed{g+7}=13\implies 2g=6\implies g=\cfrac{6}{2}\implies g=3\\\\\\\stackrel{\textit{since there are 3 gals}}{b = g+7}\implies b=3+7$

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Which number is equivalent to (1/3)^-4 A.12 B.81 C.1/12 D.1/81

marishachu [46]

Answer:

Step-by-step explanation:

(1/3)^-4

=1/[(1/3)^4]

=1/(1/81)

=81

6 0

3 years ago

A circle has a diameter of 100 cm. which of these is closest to its area? show or explain your reasoning

patriot [66]

Answer:31r

Step-by-step explanation:

Formula=πd

22/7 × 100

3.14 × 100

314 cm square

7 0

3 years ago

ABCD is a rhombus. If AC = 24 and BD = 18, what is the perimeter of ABCD?

amm1812

Answer:

Step-by-step explanation:

A rhombus has parallel sides so it's simply

24+24+18+18=84

6 0

3 years ago

8(2x + 3) = PxQ

anyanavicka [17]

Respuesta:

P = 16; Q = 24

P = 0; Q = 0

Explicación paso a paso:

Dada la relación:

8 (2x + 3) = Px + Q

Abra el soporte

16x + 24 = Px + Q

Los valores de P y Q para los que la ecuación tiene infinidad de solución:

Px = 16x

Q = 24

Por tanto, en P = 16; Q = 24, la ecuación tiene infinidad de soluciones.

Valores de P y Q para los que la ecuación no tiene solución:

Px = 0; P = 0

Q = 0

Por tanto, los valores de P y Q para los que la ecuación no tiene solución es 0

5 0

3 years ago

The average time an individual reads online national news reports is 49 minutes. Assume the standard deviation is 16 minutes and

Alexus [3.1K]

Answer:

11.70% probability someone will spend no more than 30 minutes reading online national news reports.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore 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 pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 49, \sigma = 16$

What is the probability someone will spend no more than 30 minutes reading online national news reports?

This is at most 30 minutes, so 30 or less minutes. This is the pvalue of Z when X = 30.

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

$Z = \frac{30 - 49}{16}$

$Z = -1.19$

$Z = -1.19$ has a pvalue of 0.1170.

So there is a 11.70% probability someone will spend no more than 30 minutes reading online national news reports.

4 0

3 years ago