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AleksandrR [38]
3 years ago
5

2 times what number minus 3 is 5

Mathematics
2 answers:
pychu [463]3 years ago
7 0
4 is the answer because

5+3 = 8

2/8

4

Leviafan [203]3 years ago
4 0

Answer:

4

Step-by-step explanation:

1. Make an equation

2x-3=5

2. Solve for x

5+3=8

2x = 8

8/2 = 4

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Which of the following is a perfect square trinomial?
yanalaym [24]
Your answer is D. 16x² - 56xy + 49y².

A perfect square trinomial is the result of a squared binomial, like (a + b)². Using this example, the perfect square trinomial would be a² + 2ab + b², as that is what you get when you expand the brackets.

Therefore, to determine which of these is a perfect square trinomial, we have to see if it can be factorised into the form (a + b)².

I did this by first square rooting the 16x² and 49y² to get 4x and 7y as our two terms in the brackets. We automatically know the answer isn't A or B as you cannot have a negative square number.

Now that we know the brackets are (4x + 7y)², we can expand to find out what the middle term is, so:

(4x + 7y)(4x + 7y)
= 16x² + (7y × 4x) + (7y × 4x) + 49y²
= 16x² + 28xy + 28xy + 49y²
= 16x² + 56xy + 49y².

So we know that the middle number is 56xy. Now we assumed that it was (4x + 7y)², but the same 16x² and 49y² can also be formed by (4x - 7y)², and expanding this bracket turns the +56xy into -56xy, forming option D, 16x² - 56xy + 49y².

I hope this helps!
6 0
3 years ago
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For what value of x is sin x = cos 19°, where 0°< x < 90°? 38°
mrs_skeptik [129]
Sin x = cos (90-x)
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The answer is 71 degrees.
5 0
2 years ago
Choose the algebraic expression that best matches this verbal description: "the sum of 3 and 7 times a number x
aniked [119]

Answer:

b

Step-by-step explanation:

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oksano4ka [1.4K]

Answer:

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Step-by-step explanation:

we know that

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using the net

The surface area is equal to

SA=2[(16)(6)]+2[(16)(8)]+2[(8)(6)]

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What is the sign of the product (–7)(–2)(–5)(1)?
zubka84 [21]
The product would be negative. Since there are three negative integers, the product would be negative. Two negatives make a positive, but another negative makes the end result negative.
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3 years ago
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