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blondinia [14]
3 years ago
12

Please help me ! I gave three extra points and with give you Brainly, if you put a link I will report you

Mathematics
1 answer:
melisa1 [442]3 years ago
5 0

Answer:

19.5

Step-by-step explanation:

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Solve the equation 7/z-1 = 9/z+4
algol [13]

Answer:

z is equal to 18.5

Step-by-step explanation:

When an equation is in the format a/b = c/d, the quickest way to simplify it is to cross multiply.  Each side is multiplied by the other sides denominator, eliminating the division:

\frac{7}{z-1} = \frac{9}{z + 4}\\7(z + 4) = 9(z - 1)\\7z + 28 = 9z - 9\\7z - 9z = -9 - 28\\-2z = -37\\z = 37/2\\z = 18.5

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3 years ago
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snow_tiger [21]

Answer:

Step-by-step explanation:

We know by the Triangle Angle-Sum Theorem that the angles of a triangle all add up to equal 180.  So we find angle B:

180 - 82 - 55 = 43

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\frac{sin(55)}{8}=\frac{sin(43)}{b}

Cross multiply to get

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b=\frac{8sin(43)}{sin(55)} so

b = 6.6605

3 0
4 years ago
I need help on question number 26
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Find the measure of side b.
malfutka [58]
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PLS ANSWER ASAP I WILL MAKE YOU BRAINLIEST ( Number 10.)
OLEGan [10]

Answer:

x=160°

since the sum of angles of the shape measures 540°

by summing up the values, we have

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6 0
3 years ago
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