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zlopas [31]
3 years ago
12

If y varies directly with x, and y = 2 when x = −4, what is the value of y when x = 20

Mathematics
1 answer:
Klio2033 [76]3 years ago
3 0

Answer:

y = - 10

Step-by-step explanation:

Given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 2 when x = - 4, that is

2 = - 4k ( divide both sides by - 4 )

= k, that is

k = -  

y = -  x ← equation of variation

When x = 20, then

y = -  × 20 = - 10

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What times 3 equals 3/10
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Answer:

1/10

Step-by-step explanation:

Divide 3/10 by 3. Remember to "keep, flip, change".

3/10 ÷ 3/1

3/10 × 1/3

Multiply across: 3/10 × 1/3 = 3/30

Simplify: 3/30 = 1/10

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Please help me on these questions, Thanks
gogolik [260]
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So  six and three fifths = (30 + 3) fifths  =  thirty-three fifths.

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31).  Twenty-seven of the thirds are the same as  (27/9)  = 3 .
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5 0
3 years ago
The angles in a triangle are such that one angle is 120 degrees more than the smallest angle, while the third angle is 3 times a
Westkost [7]

Answer:

a = 132; b = 12; c = 36

Step-by-step explanation:

a = b + 120

b = b

c = 3b

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(substitute these into the above equation)

b + 120   + b    + 3b  = 180

5b + 120 = 180

       -120    -120

5b = 60

/5     /5

b = 12

(substitute b back into the first equations)

a = (12) + 120 = 132

b = (12)

c = 3(12) = 36

(check: 132 + 12 + 36 = 180)

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3 years ago
Complete the square to make a perfect square trinomial. Then, write the result as a binomial squared.
Tatiana [17]

Answer:

Take the coefficient of ''n'', divide it by 2, and raise it to the second power;

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3 years ago
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