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3 years ago

Just need help 1-3 because it’s not easy

Mathematics

1 answer:

neonofarm [45]3 years ago

7 0

1 Yes
2 No
3 No
Hope this helps

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AREAS AND VOLUMES OF SIMILAR SOLIDS URGENT?

Novosadov [1.4K]

Two similar prisms have proportional dimensions. Find the ratio between lengths of these prisms:

$k=\dfrac{7}{5}$ .

The ratio between volumes of similar prisms is

$\dfrac{V_{large}}{V_{small}}=k^3$ .

If volume of small prism is 50 cub. m, then

$\dfrac{V_{large}}{50}=(\dfrac{7}{5} )^3=\dfrac{343}{125},\\V_{large}=\dfrac{343\cdot 50}{125} =137.2$ cub. m.

Answer: 137.2 cub. m.

6 0

4 years ago

2/3 of a class are girls.

miv72 [106K]

Answer:

Step-by-step explanation:

https://justmaths.co.uk/2015/07/23/new-gcse-error-intervals/2/3%20of%20a%20class%20are%20girls.%20w%20a)%20What%20is%20the%20ratio%20girls%20to%20boys%20in%20the%20class?%20Note:%20Give%20your%20answers%20in%20their%20simplest%20forms.%20b)%20What%20is%20the%20ratio%20boys%20to%20girls%20in%20the%20class?

3 0

3 years ago

Read 2 more answers

Tanya wants to test the theory that the exterior angles of a

PilotLPTM [1.2K]

Answer:

$f + e + d = 360^o$

Step-by-step explanation:

The question is incomplete, as what is required is not stated and the triangle is not given.

So, I will solve generally.

The proof is as follows (see attachment for triangle)

From the attachment, we have:

$a + f = 180$

$b + e = 180$

$c + d = 180$

Make f, e and d the subject

$f = 180 - a$

$e = 180 - b$

$d = 180 - c$

Add up the equations

$f + e + d = 180 -a + 180 - b + 180- c$

Collect like terms

$f + e + d = 180 + 180+ 180-a- b - c$

$f + e + d = 540-a- b - c$

We have:

$f + e + d = 540-(a+ b + c)$

$a + b + c \to 180$ --- angles in a triangle

So, we have:

$f + e + d = 540-180$

$f + e + d = 360^o$ --- proved

6 0

3 years ago

The kids' pool in Ben's neighborhood is rectangular-shaped and covers an area that

n200080 [17]

<h3>Answer: 13x-8 units by 13x+8 units</h3>

Explanation:

Factor using the difference of squares rule

$a^2 - b^2 = (a-b)(a+b)\\\\(13x)^2 - (8)^2 = (13x-8)(13x+8)\\\\169x^2 - 64 = (13x-8)(13x+8)$

The rectangular pool has dimensions of 13x-8 units by 13x+8 units.

6 0

2 years ago

You want to make five-letter codes that use the letters A, F, E, R, and M without repeating any letter. What is the probability

Vaselesa [24]

Any of the given 5 letters can be at the start of the code.
Total choices = 5

We want the code to start with A
Choices in favor = 1

Probability = favorable/total = 1/5 = 0.20

5 0

3 years ago

Read 2 more answers