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Karo-lina-s [1.5K]
3 years ago
6

Answer a and b ASAP

Mathematics
1 answer:
melomori [17]3 years ago
6 0

Answer:

The area of the rectangle is 48cm2

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What is 3/10 divided by 2/4
iVinArrow [24]
3/5 is the answer.

Explanation:
Easy way is make them into decimals, then divide.
So 3/10 = .3
And 2/4 = .5
So .3/.5 = .6
Or 6/10 = 3/5

Hope this helps! Also nice zenitsu pfp
3 0
2 years ago
Read 2 more answers
the floor of a room is in the shape of a square of side 4.8m. the floor is to be covered with square tiles of perimeter 1.2m. Fi
Aloiza [94]

Answer:

the room square side is 4.8m

Area of the room is= 4.8=²23.04²m

perimeter of square tiles=4a =1.2

a=1.2/4

or a=o.3m

area of the square tiles =0.3²=0.09m²

numbers of the tiles are rcover floor of the room

23.0.4/0.09=256

each tiles cost Rs 27

the total cost=256*27=6912

the th coalst cover by the th floor is Rs .6912

7 0
3 years ago
An appliance repairman charges $35
Schach [20]

Answer:

3 hours.

Step-by-step explanation:

I'm assuming that you are asking how many hours the repairman worked in this problem. To find the solution, use the equation $125=35+ 30x.

3 0
3 years ago
I need help please with my questions.
RideAnS [48]

Answer:

1. (4a+3)(4a-3)

2. (2m + 5)(2m-5)

3. (4b-5)²

4. (2x-1)²

5. (3x+1)(3x-1)

6. (n+5)(n-5)

7. (n²-10)²

8. (a²+3)(a²-3)

9. (k²+6)(k²-6)

10. (n²+7)(n²-7)

Step-by-step explanation:

For special products like these, just remember the

Difference of Squares formula:

a^2 -b^2 = (a+b)(a-b)

and

Square of difference formula:

a^2-2ab+b^2=(a-b)²

1. 16a²-9 follows the difference of squares form:

a² - b² = (a+b)(a-b)

So all we need to do is get the square root of a and b and follow the form:

(√16a²) - (√9) = (4a +3) (4a - 3)

Let's check through FOIL:

(4a +3) (4a - 3)

16a² - 12a + 12a - 9

16a² - 9

2. 4m² - 25 also follows the same form of difference of squares:

(√4m²) - (√25) = (2m +5) (2m - 5)

Let's check!

(2m +5) (2m - 5)

4m² + 10m - 10m -25

4m² - 25

3. 16b² - 40b + 25 follows the form of square of difference:

a² - 2ab + b² = (a - b)²

√16b² = 4b

√25 = 5

(4b - 5)²

Let's check!

(4b-5)(4b - 5)

16b² - 20b - 20b + 25

16b² - 40b + 25

HEre's another way to look at it:

First multiply the coefficients of the first and last term:

16 x 25 = 400

Next think of two numbers that when you multiply them, you will come up with 400 and sum up to -40. The two numbers would be -20 and -20 which will be the middle term

So it would fill in this way:

16b² - 20b - 20b + 25

Factor the equation:

(16b² - 20b) (-20b + 25)

4b(4b-5) - 5(4b-5)

(4b-5)(4b-5) = (4b-5)²

4. 4x² - 4x + 1 follows that same form:

√4x² = 2x

√1 = 1

(2x - 1)²

Let's check!

(2x - 1)(2x - 1)

4x² - 2x - 2x + 1

4x²- 4x + 1

5. 9x² - 1 follows the form of difference of squares:

√9x² - √1 = (3x + 1)(3x - 1)

Let's check!

(3x + 1)(3x - 1)

9x² + 3x - 3x - 1

9x² - 1

6. n² - 25 follows the form of difference of squares:

√n² - √25 = (n + 5)(n - 5)

Let's check!

(n + 5)(n - 5)

n² + 5n - 5n - 25

n² - 25

7. n⁴ - 100

√n⁴ - √100 = (n² + 10)(n² - 100)

Let's check!

(n² + 10)(n² - 100)

n⁴ + 10n² - 10n² -100

n⁴ - 100

8. a⁴ - 9

√a⁴ - √9 = (a² + 3)(a² - 3)

Let's check!

(a² + 3)(a² - 3)

a⁴ + 3a² - 3a² - 9

a⁴ - 9

9. k⁴ - 36

√k⁴ - √36 = (k² + 6) (k² - 6)

Let's check!

(k² + 6) (k² - 6)

k⁴ + 6k² - 6k² - 36

k⁴ - 36

10. n⁴ - 49

√n⁴ - √49 = (n² + 7) (n² - 7)

Let's check!

(n² + 7) (n² - 7)

n⁴ +7n² - 7n²- 49

n⁴ - 49

5 0
3 years ago
2√7 times 3 √21 simply
ElenaW [278]
21=3*7
(2√7)(3√(3*7)=6√(3*7²)=6*7(√3)=42√3

Answer: (2√7)(3√21)=42√3
8 0
2 years ago
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