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Zarrin [17]
2 years ago
13

Plssssssssssssssssssssss helpppp​

Mathematics
2 answers:
olga2289 [7]2 years ago
7 0
The answer should be 2kg
morpeh [17]2 years ago
5 0

Answer:

I think its 2 kg anyone correct me if I'm wrong!

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A model train is built at a scale of 1 to 60. If the model train is 10 inches long, how many feet long is the actual train?
lakkis [162]

Answer:

60 feet

Step-by-step explanation:

4 0
2 years ago
What is the equation of a line with a slope of 7 and a point (1, 8) on the line?
Montano1993 [528]

8=m+7

m=1

so

y=x+7

that is the equasion

6 0
3 years ago
Read 2 more answers
(i) Write the expansion of (x + y)² and (x - y)². (ii) Find (x + y)² - (x - y)² (iii) Write 12 as the difference of two perfect
zaharov [31]

Answer:

1a (x + y)² = x² + 2xy + y²

1b. (x - y)² = x² - 2xy + y²

2. (x + y)² - (x - y)² = 4xy

3. 4² – 2² = 12

Step-by-step explanation:

1a. Expansion of (x + y)²

(x + y)² = (x + y)(x + y)

(x + y)² = x(x + y) + y(x + y)

(x + y)² = x² + xy + xy + y²

(x + y)² = x² + 2xy + y²

1b. Expansion of (x - y)²

(x - y)² = (x - y)(x - y)

(x - y)² = x(x - y) - y(x - y)

(x - y)² = x² - xy - xy + y²

(x - y)² = x² - 2xy + y²

2. Determination of (x + y)² - (x - y)²

This can be obtained as follow

(x + y)² = x² + 2xy + y²

(x - y)² = x² - 2xy + y²

(x + y)² - (x - y)² = x² + 2xy + y² - (x² - 2xy + y²)

= x² + 2xy + y² - x² + 2xy - y²

= x² - x² + 2xy + 2xy + y² - y²

= 2xy + 2xy

= 4xy

(x + y)² - (x - y)² = 4xy

3. Writing 12 as the difference of two perfect square.

To do this, we shall subtract 12 from a perfect square to obtain a number which has a perfect square root.

We'll begin by 4

4² – 12

16 – 12 = 4

Find the square root of 4

√4 = 2

4 has a square root of 2.

Thus,

4² – 12 = 4

4² – 12 = 2²

Rearrange

4² – 2² = 12

Therefore, 12 as a difference of two perfect square is 4² – 2²

7 0
3 years ago
If you borrow $1,200 for 3 years at an annual interest rate of 4% how much will u pay?
Anastaziya [24]
I=Prt
I=$1,200(0.04)3
I=$144
7 0
3 years ago
Simplify the expression. 6(7n – 5m) + 8m
borishaifa [10]
6(7n – 5m) + 8m
42n - 30m + 8m
42n -22m
Answer: 42n-22m

7 0
3 years ago
Read 2 more answers
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