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HACTEHA [7]
3 years ago
13

If the value of "y" varies directly with "X" and y = -8 when x = 20, find "y" if x = -4.

Mathematics
1 answer:
natka813 [3]3 years ago
5 0

Answer:

y = 10 when x is -4

will be the correct answer

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It takes Lucas 3 hours to cycle from his home to his friends village but if travels 5 mph slower, it will take him 1.5 hours lon
Alika [10]

The distance from friend's village to Lucas's house is 45 miles

Step-by-step explanation:

Lets assume the distance from Lucas home to friend's village is x miles

The time taken to cycle from Lucas home to friend's village is 3 hrs....t₁

The time taken if travelling at a 5 mph reduced speed is 1.5 hrs longer......t₂

t₂=4.5 hrs

t₁= 3 hrs

Speed for cycle in first instance, where t₁=3 hrs and distance is x miles

s₁=d/t = x/3 mph

Speed for cycle if travelling at a slower speed,

s=\frac{x}{3}-5

Time taken in the second instance when travelling at a slower speed

=\frac{x}{\frac{x}{3}-5 }=4.5\\ \\\frac{3x}{x-15} =4.5\\\\\\3x=4.5(x-15)\\\\3x=4.5x-67.5\\\\\\67.5=4.5x-3x\\\\\\67.5=1.5x\\\\\\67.5/1.5=x\\\\\\45=x

The distance from friend's village to Lucas's house is 45 miles

Learn More

Formula for speed:brainly.com/question/13664094

Keywords: cycle,home, village, travels,slower,longer

#LearnwithBrainly

6 0
3 years ago
4x - 3y = 12 without graph​
Maru [420]

Answer:

Make it an y=mx+b equation. -3y=-4x+12

Divide everything by -3

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Step-by-step explanation:

3 0
3 years ago
True or False, the following numbers are in order from greatest to least:<br> 11/10, 8/7,-2.34*
rjkz [21]

Answer:

fasle

Step-by-step explanation:

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4 years ago
How would eight billion, nine hundred seventy-seven thousand, thirteen be written in standard form?
zheka24 [161]

Answer:

8 billion > 8,000,000,000

977 thousand > 977,000

13> 13

8,000,977,013

Step-by-step explanation:

3 0
2 years ago
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Which formula gives the area of a parallelogram? (3)
SVEN [57.7K]

Answer:

A = bh (the last one)

Step-by-step explanation:

To find the area of a parallelogram, multiply the base by the height. The formula is: A = B * H where B is the base, H is the height, and * means multiply. The base and height of a parallelogram must be perpendicular.

5 0
3 years ago
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