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3 years ago

Factorise 4y^2-23y+15

Mathematics

1 answer:

ivann1987 [24]3 years ago

8 0

Answer:

(4y-3) (y-5)

Step-by-step explanation:

hope that helps

if correct plz mark as brainliest

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19NBoli

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There were 24 green jelly beans which made up 8%of all the jelly beans in the bag

Zanzabum

There are 300 jelly beans in the bag.

24÷6=4
4×2=8
5×2=10
5×6=30
30×10=300

Proof:
24/300 = ?/100
24×100=2400
2400÷300=8

Hope this helps! :)

6 0

3 years ago

What is 3/4 of 4/5. Plz help

Dmitriy789 [7]

Answer:

3/5

Step-by-step explanation:

We want to find 3/4 of 4/5.

The keyword <em>of</em> tells us that we need to multiply. Therefore:

$\frac{3}{4}\times\frac{4}{5}$

Multiply:

$=12/20=3/5$

So, 3/4 of 4/5 is 3/5.

We can confirm this by converting them to decimals.

4/5 is 0.8.

3/4 is 0.75.

0.75 or 75% of 0.8 is indeed 3/5 or 0.6.

6 0

3 years ago

In a population distribution, a score of x=57 corresponds to z=-0.25 and a score of x=87 corresponds to z=1.25. Find the mean an

Serggg [28]

Here is dependence between scores and x-values:

$Z_i=\dfrac{X_i-\mu}{\sigma},$

where $\mu$ is the mean, $\sigma$ is standard deviation and i changes from 1 to 2.

1. When i=1, $Z_1=-0.25,\ X_1=57,$ then

$-0.25=\dfrac{57-\mu}{\sigma}.$

2. When i=2, $Z_2=1.25,\ X_2=87,$ then

$1.25=\dfrac{87-\mu}{\sigma}.$

Now solve the system of equations:

$\left\{\begin{array}{l}-0.25=\dfrac{57-\mu}{\sigma}\\ \\1.25=\dfrac{87-\mu}{\sigma}.\end{array}\right.$

$\left\{\begin{array}{l}-0.25\sigma=57-\mu\\ \\1.25\sigma=87-\mu.\end{array}\right.$

Subtract first equation from the second:

$1.25\sigma-(-0.25\sigma)=87-57,\\ \\1.5\sigma=30,\\ \\\sigma=20.$

Then

$1.25=\dfrac{87-\mu}{20},\\ \\87-\mu=25,\\ \\\mu=87-25=62.$

Answer: the mean is 62, the standard deviation is 20.

3 0

3 years ago

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What is the area of the kite? A kite has a width of 14 feet and a height of 6 feet.

balu736 [363]

The area of the kite is 84 feet

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3 years ago

F(x)= x^2 - 2x + 7<br> Find F(-1)

Leni [432]

Answer:f(1)=-4, f(1)=1

Just substitute the value to the x, Like this.

F(x)=x²+2x-7

F(1)=(1)²+2(1)-7

=1+2-7

=3-7

=-4

Step-by-step explanation:

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3 years ago

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