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ratelena [41]
3 years ago
14

What is the value of x in the proportion x + 1 / x+3 = 15/ 21 a.4 b.1/3 c.1/4 d.3

Mathematics
2 answers:
vladimir2022 [97]3 years ago
8 0
×+1/×+3=15/21
×+1=15(×+3)/21
×+1=15×+45/21
21(×+1)=15×+45
21×+21=15×+45
21×-15×=45-21
6×=24
×=4
lesantik [10]3 years ago
3 0
<span>What is the value of x in the proportion x + 1 / x+3 = 15/ 21
a.4
b.1/3
c.1/4
d.3</span>
the answer is            
a.) 4
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Plz help me with this
Genrish500 [490]

Answer:  D) 10 sin (πx) - 5

<u>Step-by-step explanation:</u>

The range (maximum - minimum) is 5 - (-15) = 20

The amplitude (A) is range (20) ÷ 2 = 10

The vertical shift (D) is maximum (5) - amplitude (10) = -5

Of the given options, only A & D are candidates.  Now we need to decide if it is a cos graph (A) or a sin graph (D).  If we shift the graph up 5 units (to eliminate the vertical shift) , the graph would pass through the origin.  Thus it is a sin graph and the answer must be option D.

7 0
3 years ago
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Mrrafil [7]
Answer: a = 1.75

Explanation :
4a + 7
Using transposition method we move 4 and change its sign
a = 7 / 4
7 / 4 = 1.75

Therefore,
a = 1.75
4 0
2 years ago
⦁ To the nearest tenth, find the perimeter of ∆ABC with vertices A(2,4), B(-2,1) and C(2,1). Show your work.
Colt1911 [192]
We need the length of the sides.
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