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3 years ago

PLEEAAAASE help if a+1 is divisible by 3 prove that 4+7a is divisible by 3 too

Mathematics

1 answer:

Lemur [1.5K]3 years ago

3 0

Answer:

Given a is 5

Step-by-step explanation:

I. Given a is 5

= a + 1

= 5 + 1

= 6

6 is divisible by 3 => true

II. Find 4 + 7a value

= 4 + 7(5)

= 4 + 35

= 39

39 is divisible by 3 => true

III. Prove by

6 ÷ 3 = 3

39 ÷ 3 = 13

Hope that help :)

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Charlie and Rashan collect miniature cars. They have the same number of cars in their collections. Charlie sold 5/8 of his colle

gtnhenbr [62]

Answer:

5/8 is more than 1/2 4/10 is less than 1/2 so 5/8 is more than 4/10

So that means that Charlie sold more of his collection than Rashan

Step-by-step explanation:

Hope this helped out.

4 0

2 years ago

A 45 foot ladder is leaning against a building. If the bottom of the ladder is 27 feet from the base of the building, how tall i

taurus [48]

Answer:

The height of building to the nearest foot is h = 36 foot

Step-by-step explanation:

We have given,

Length of ladder leaning against a building, l = 45 foot

Bottom length between ladder and the building , b = 27

Now, we need to find the height of building to the nearest foot.

Let the height of building be h.

Using Pythagoras theorem,

$l^{2} = b^{2} +h^{2}$

Here, l = 45 , b = 27 and h =?

So,

$45^{2} = 27^{2} +h^{2}$

h² = 45² - 27²

h = √(45² - 27²)

h = 36

The height of building to the nearest foot is h = 36 foot

8 0

3 years ago

Read 2 more answers

The value of 46,395 in 4

Cerrena [4.2K]

The value of 4 is in the 10,000 place. :)

3 0

3 years ago

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In the X Y -plane, Line crosses the Y - axis at the point (0,3) and passes through the point ( 4,5). Which of the following is a

nikitadnepr [17]

Answer: y = 1/2x + 3

Step-by-step explanation:

Use the equation y=mx +b

Find the slope (m) of the line by finding the difference in y over the difference in x. Or "rise over run".

The y-intercept (b) is 3 (when x is zero, it is y).

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3 years ago

Find the area of a circle with diameter 12 cm.

luda_lava [24]

Answer:

113.04 cm.

Step-by-step explanation:

Step 1: Formula/explain

To find the area of a circle, multiply the radius by itself twice, then multiply the product pi.

$a=\pi r^2(3.14*radius*radius)$

Step 2: Solve

According to the word problem, the circle has a diameter of 12. This means it has a radius of 6.

Now, we plug the numbers into formula.

$\pi 6^2 (3.14*6*6)=113.04$

Step 3: Conclude

Therefore, the area of this circle is 113.04 cm.

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3 years ago