3 years ago

If you answer right you get brainliest. this is for 30 points

Mathematics

1 answer:

Phoenix [80]3 years ago

3 0

Answer:

4th one

Step-by-step explanation:

18/6=3 3 units on the y-axis / vertical

That's the only one with (-4,-2)

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The value of y is directly proportional to the value of x.If y=35 when x=140, what is the value of y when x=70

Elodia [21]

Y varies x
Invite the constant
y = kx
Kx/x = y/x
K = y/x
Slot in the values
K = 35/140
= 1/4 or 0.25

What is the value of y when x=70
y=kx
y = 35/140 x 70/1
y = 35/2
y = 17 1/2 or 17.5

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3 years ago

evelyn rode her horse along a triangular path. The distance she traveled south was 5 times the distance she traveled east. Then

cricket20 [7]

(5x)^2 + x^2 = c^2

25x^2 + x^2 =c^2

sqrt 26 x ^ 2 = sqrt c^2

x sqrt 26= c

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3 years ago

Work out the surface area of the solid cuboid. 2.5m 2m 5m The diagram is not drawn to scale.

kozerog [31]

Answer:

the formula for TSA of a cuboid is (lb+bh+hl)

soo it will be

(2.5x2+2x5+5x2.5)

(5+10+10)

(25)

so 25 cm^2

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2 years ago

To eliminate the x terms and solve for y in the fewest steps, by which constants should the equations be multiplied by before ad

ludmilkaskok [199]

Answer:

its c

Step-by-step explanation:

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3 years ago

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a 23 gram sample of a substance thats a by-product of fireworks has a K-value of .13. whats the substances half life in days

nata0808 [166]

Given:
Initial mass, m₀ = 23 g
Decay constant, k = 0.13

Exponential decay obeys the equation
$m(t)=m_{0} e^{-kt}$
where t = time, days

For half life, the mass is m = m₀/2.
Therefore
$e^{-0.13t} = \frac{1}{2} \\ -0.13t = ln(0.5)\\t= \frac{ln(0.5)}{-0.13} =5.33$

Answer: The half life is 5.33 days

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3 years ago

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