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Ray Of Light [21]
3 years ago
14

Help me answer this question please help it is hard

Mathematics
2 answers:
lapo4ka [179]3 years ago
6 0
The answer is 21.63.
joja [24]3 years ago
5 0
The answer is 21.6. To find this I used <span>Pythagorean Theorem since a rectangle can be split into two right triangles to find the diagonal which is the hypotenuse you do 12^2+18^2= c^2. Hope it helped.

</span><span />
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What is the value of E(-1) n (3n+2)?
RoseWind [281]
<h3>Answer:  C) 6</h3>

====================================================

Explanation:

The weird looking E symbol is the greek uppercase letter sigma. It refers to a sum.

It tells us to add up terms in the form (-1)^n*(3n+2) where n is an integer ranging from n = 1 to n = 4.

------------------

If n = 1, then we have

(-1)^n*(3n+2) = (-1)^1*(3*1+2) = -5

Let A = -5 as we'll use it later.

------------------

If n = 2, then

(-1)^n*(3n+2) = (-1)^2*(3*2+2) = 8

Let B = 8 since we'll use this later as well

------------------

If n = 3, then

(-1)^n*(3n+2) = (-1)^3*(3*3+2) = -11

Let C = -11

-------------------

If n = 4, then

(-1)^n*(3n+2) = (-1)^4*(3*4+2) = 14

Let D = 14.

--------------------

We'll add up the values of A,B,C,D to get the final answer

A+B+C+D = -5+8+(-11)+14 = 6

This means that

\displaystyle \sum_{n=1}^{4}(-1)^n(3n+2) = 6

6 0
3 years ago
Ruth decides to use the method of proportions and similar triangles to find the height of a tree. She measures the length of the
musickatia [10]

Answer:

c. 24 ft

Step-by-step explanation:

if the 12 inch ruler casts a 6 inch shadow (shadow has half size) then a tree with 12 feet long shadow will have a height of 24 feet

5 0
3 years ago
Please answer this correctly <br> Is the answer <br> 6:07am<br> 9:11am<br> 6:39am<br> 10:11am
nika2105 [10]

Answer:10:11 am

Step-by-step explanation:

3 0
3 years ago
Which of the following is the correct factorization of the trinomial below? -7x^2-5x+18
ryzh [129]

Answer: C. (-7x+9)(x-2)

Step-by-step explanation:

1. Factor out the negative sign.

−(7x^2+5x−18)

2. Split the second term in 7x2+5x−18 into two terms.

−(7x^​2​​+14x−9x−18)

3, Factor out common terms in the first two terms, then in the last two terms.

−(7x(x+2)−9(x+2))

4.  Factor out the common term x+2x+2x+2.

−(x+2)(7x−9) or (-7x+9)(x-2)

8 0
3 years ago
Read 2 more answers
OULLO<br> Solve 2(x + 1) = 2x + 2.<br><br> All real numbers<br> No solution<br> 0<br> 1
mojhsa [17]

Answer:

All real numbers

Step-by-step explanation:

2(x + 1) = 2x + 2

2x + 2 = 2x + 2

2x + 2 - 2x - 2 = 2x + 2 - 2x - 2

0 = 0

All real numbers

3 0
3 years ago
Read 2 more answers
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