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3 years ago

Find the product (4a+6b)(a-b)

Mathematics

1 answer:

slava [35]3 years ago

4 0

(4a+6b)×(a-b) =4a(a-b)+6b(a-b) =4a^2-4ab+6ab-6b^2 =4a^2+2ab-6b^2

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in a class of 32 students the mean height of the 14 boys is 1.56 meters and the mean height of all 32 students is 1.151 meters.

Nimfa-mama [501]

Answer: Hence, Mean height of the girls is: 1.48

Step-by-step explanation: It is given that:

in a class of 32 students .

the mean height of 14 boys is 1.56 and the mean height of all 32 students is 1.515.

Since there are 14 boys in a class.

So, number of girls is equal to (32-14)=18.

The mean height of 14 boys is 1.56.

Hence the sum of height of 14 boys is= 1.56×14=21.84

Similarly mean height of 32 students is 1.515.

Hence, sum of height of 32 students=1.515×32=48.48.

Let x denote the mean height of 18 girls.

Hence, sum of height of 18 girls is: 18 x.

Now,

18x+21.84=48.48

( since sum of height of girls and boys is equal to the sum of height of all the students)

so, 18x=48.48-21.84

18 x=26.64

Hence, x=1.48

Hence, Mean height of the girls is: 1.48

4 0

3 years ago

What is number 3??????????????????

notsponge [240]

If its the one under the one with a written answer(the first on blank at the top) its b. 20% did not arrive.

6 0

3 years ago

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Does the order in which you add two integers with the same sign affect the sum

andrey2020 [161]

when you add two negatives its just like regular number, -3+-5=-8 same as 3+5=8

8 0

3 years ago

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What is the value of the expression below when w = 3. 4w^2 - 7w - 8

Makovka662 [10]

<h2>Answer:<em> </em><em><u>w =(-40-√4320)/-34=(20+6√ 30 )/17= 3.110 </u></em></h2><h2><em><u> w =(-40+√4320)/-34=(20-6√ 30 )/17= -0.757</u></em></h2>

Step-by-step explanation: The prime factorization of 4320 is

2•2•2•2•2•3•3•3•5

To be able to remove something from under the radical, there have to be 2 instances of it (because we are taking a square i.e. second root).

√ 4320 = √ 2•2•2•2•2•3•3•3•5 =2•2•3•√ 30 =

± 12 • √ 30

√ 30 , rounded to 4 decimal digits, is 5.4772

So now we are looking at:

w = ( -40 ± 12 • 5.477 ) / -34

Two real solutions:

w =(-40+√4320)/-34=(20-6√ 30 )/17= -0.757

or:

w =(-40-√4320)/-34=(20+6√ 30 )/17= 3.110

MY HEAD HURTS!

3 0

3 years ago

Elan Coil [88]

Answer:

Step-by-step explanation:

bvgfyr

4 0

3 years ago

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