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2 years ago

Can some one help me Pls

Mathematics

1 answer:

Firlakuza [10]2 years ago

8 0

Answer:

A is one of the true statements because 25 is the largest number that 50 and 75 can both divide evenly into.

D is the other true statement because 45 is the lowest number that 5 and 9 can both multiply into.

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What is the sum of the first 7 terms of the series −4+8−16+32−... ?

blondinia [14]

The terms appear to increase by a multiple of -2. The first 7 terms are:

-4 + 8 + -16 + 32 + -64 + 128 + -256. Add these together.

The sum of these numbers is -172.

4 0

2 years ago

A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1491 and the standard deviati

Alinara [238K]

Answer:

$z(1910)=1.3429\\\\z(1230)=-0.9006\\\\z(2190)=2.2404\\\\z(1380)=-0.3558$

Step-by-step explanation:

-Given the population mean is $\mu=1491$ and the standard deviation is $\sigma=312$ , we calculate the z-scores using the formula:

$z=\frac{\bar x-\mu}{\sigma}$

#The z-score for 1910 can be calculated as:

$z(1910)=\frac{x-\mu}{\sigma}\\\\=\frac{1910-1491}{312}\\\\=\frac{419}{312}\\\\=1.3429$

#The z-score for 1230can be calculated as:

$z(1230)=\frac{x-\mu}{\sigma}\\\\=\frac{1230-1491}{312}\\\\=\frac{-281}{312}\\\\=-0.9006$

#The z-score for 2190 is calculated as follows:

$z(2190)=\frac{x-\mu}{\sigma}\\\\=\frac{2190-1491}{312}\\\\=\frac{699}{312}\\\\=2.2404$

#The z-score for 1380 is calculated as:

$z(1380)=\frac{x-\mu}{\sigma}\\\\=\frac{1380-1491}{312}\\\\=\frac{-111}{312}\\\\=-0.3558$

7 0

2 years ago

1.<br> Carly has 35 pens in her pencil case and 20% don't work. How many don't work?

AnnyKZ [126]

Answer:

7 pens

Step-by-step explanation:

35 x 20%

35 x 0.2

= 7

5 0

2 years ago

Read 2 more answers

What is the GCF?<br>6x² + 24x<br>

Gelneren [198K]

Answer:

6x(x + 4)

Step-by-step explanation:

Both 6x^2 and 24x are divisible by 6x

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2 years ago

Which expression is equivalent to<br> 3(2x+ 5), no matter what value is substituted in for x

Viktor [21]

Answer:

6x+15

Step-by-step explanation:

5 0

2 years ago