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3 years ago

4x - 3y = 23

Mathematics

1 answer:

igor_vitrenko [27]3 years ago

4 0

Answer:

okay so 1st

4x - 3y = 23 (u gonna have to add 3y to - 3y & add it to 23)

+3y +3y (like this) once you got that, add 3 to 23 which is 26

4x = 26y (like this)

---- ------

4 13

so x = 2

Step-by-step explanation:

I don't know about the second one but if I'm right for the first one then let me know lolllllsss I put 13 instead of 4 under 26y because 4 cannot go through 26 but 2 × 13 is 26

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A consumer organization estimates that over a 1-year period 20% of cars will need to be repaired once, 5% will need repairs

gtnhenbr [62]

Answer:

a) 0.5476

b) 0.0676

c) 0.4524

Step-by-step explanation:

Given this information, we can conclude that 74% of the cars won't need any repairs over a 1-year period (100 - 20 - 5 - 1 = 74%). And 26% will need at least 1 repair over a 1-year period.

P(car doesn't need repair) = 0.74

P (car needs repair) = 0.26

If you own two cars, the probability that:

a) Neither will need repair:

We need that car 1 won't need repair AND car 2 won't need repair.

=P(Car 1 doesn't need repair) x P(Car 2 doesn't need repair)

= 0.74 x 0.74 = 0.5476

The probability that neither will need repair is 0.5476.

b) Both will need repair:

We need that car 1 needs repair AND car 2 needs repair.

P(Car 1 needs repair) x P(Car 2 needs repair)

= 0.26 x 0.26 = 0.0676

The probability that both will need repair is 0.0676

c) At least one car will need repair

Car 1 needs repair or Car 2 needs repair or both need repair.

To solve this one, it's easier to use the complement of P(neither needs repair)

1 - P(neither needs repair)

1 - (0.74)(0.74) = 1 - 0.5476 = 0.4524

The probability that at least one car will need repair is 0.4524

4 0

3 years ago

'find the equation of the line shown':

insens350 [35]

Answer:

y = x + 6

Step-by-step explanation:

The y-intercept is (0, 6). This is where the line crosses the y-axis.

The slope is 4/4, or 1: m = 1

The equation of the line is therefore y = x + 6

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3 years ago

Sara jumps off a diving board that is 6 feet above the surface of the water her height above the surface of the water h in feet

Flauer [41]

Well when she hits the water h=0 so

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t=2 seconds...

However it should be noted that h(t)=-2t^2+t+6 implies that

v(t)=dh/dt=-4t+1 and

a(t)=dv/dt=-4

Since this is a free fall equation, this would suggest that the acceleration due to gravity is -4, whether that is supposed to be -4ft/s^2 or -4m/s^2, it certainly is not on this planet! :D If it is -4ft/s^2 it could be on the Moon or if it is -4m/s^2 it could be on Mars.

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3 years ago

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rosijanka [135]

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ololo11 [35]

Answer:

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Step-by-step explanation:

Hope this helps, mark brainliest

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3 years ago