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Rashid [163]
3 years ago
13

Need help ill pay a lot just do my math test. answer every question

Mathematics
1 answer:
Ket [755]3 years ago
6 0

Answer:

a

Step-by-step explanation:

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Solve for x d(-3+x)= kx+9
olga nikolaevna [1]
1. Write the equation:
d(-3 + x) = kx + 9
2. "Open" the parenthesizes:
-3d + dx = kx + 9
3. Take kx to the left side, -3d to the right, everything with different sign (+ replace with - when transferring, - replace with +):
dx - kx = 9 + 3d
4. Factor x in the left side:
x(d - k) = 9 + 3d
5. Finally, divide the whole equation by (d - k):
x = (9 + 3d)/(d - k)
That's the final answer. Good luck!
4 0
3 years ago
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A ferry departs from a port along the Sands River at 10:00 am. The ferry travels at a speed of 15 mph in still water and returns
jek_recluse [69]

Answer:

Speed of river's current = 5 mph

Step-by-step explanation:

Let 'd' be the distance covered  

 Let x be the speed of the rivers current

Speed upstream = 15-x

speed downstream = 15+x

Time = distance / speed

time upstream = \frac{d}{15-x}

time downstream = \frac{d}{15+x}

the ferry trip upstream takes twice as long as its return trip downstream

\frac{d}{15-x}= \frac{2d}{15+x}

divide both sides by d

\frac{1}{15-x}= \frac{2}{15+x}

cross multiply

15+x= 2(15-x)

15+x= 30-2x

Add 2x on both sideds

15+3x= 30

subtract 15 from both sides and divide by 3

3x=15

x=5

Speed of river's current = 5 mph

8 0
3 years ago
If an object is rotated clockwise 130° around a center and then counterclockwise 75° around the same center, what is the angle b
Keith_Richards [23]
That would be 130 - 75  = 55 degrees answer
6 0
3 years ago
Please can someone help me with these questions photo math won’t work
FinnZ [79.3K]

Answer:

B, C, A, B

Step-by-step explanation:

3 0
3 years ago
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Marguerite is building a box from strips of wood. She needs 78 pieces of wood that are each 29 centimeters long. The wood comes
Vsevolod [243]
120 because you needed to add them up
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3 years ago
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