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3 years ago

Which of these is a set of inputs and outputs for the function f(x) = 2x + 4?

Mathematics

2 answers:

Romashka [77]3 years ago

8 0

Answer:

D. (1, 6), (2, 8), (3, 10)

Step-by-step explanation:

f(x) = 2x + 4

(1, 6)

x = 1

output = 6

f(1)

f(1) = 2(1) + 4 = 6

(2, 8)

x = 2

output = 8

f(2)

f(2) = 2(2) + 4 = 8

(3, 10)

x = 3

output = 10

f(3)

f(3) = 2(3) + 4 = 10

so, the answer is D. (1, 6), (2, 8), (3, 10)

Fed [463]3 years ago

6 0

Answer:

Step-by-step explanation:

2(1) + 4 = 6

2(2) + 4 = 8

2(3) + 4 = 10

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If you place a cup of 210 degree Fahrenheit coffee on a table in a room that is 68 degrees fareinheit, and ten minutes later, it

Lana71 [14]

Newton's Law of Cooling

Tf=Ts+(Ti-Ts)e^(-kt) where Tf is temp at time t, Ts is temp of surroundings, Ti is temp of object/fluid. So we need to find k first.

200=68+(210-68)e^(-10k)

132=142e^(-10k)

132/142=e^(-10k)

ln(132/142)=-10k

k=-ln(132/142)/10

k≈0.0073 so

T(t)=68+142e^(-0.0073t) so how long until it reaches 180°?

180=68+142e^(-0.0073t)

112=142e^(-0.0073t)

112/142=e^(-0.0073t)

ln(112/142)=-0.0073t

t= -ln(112/142)/(0.0073)

t≈32.51 minutes

8 0

3 years ago

If x = 8 units, y = 3 units, and h = 2 units, then what is the area

solniwko [45]

Answer:

8 sq.units

Step-by-step explanation:

x= base of triangle= 8units

h= height of triangle= 2 units

area of triangle= 1/2*b*h

=1/2* 8* 2

=8 sq.units

<em>Mark me as brainliest please</em>

7 0

3 years ago

Solve 3x2−3x=0 by factoring.

o-na [289]

Answer:

3x(x-1) = 0

x= 1

Step-by-step explanation:

is 3x2 supposed to mean 3x^2 i dont know

5 0

3 years ago

What’s the area of this parrelogram? (There is a photo!)<br><br> Please help me!

Aliun [14]

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2 years ago

A recent survey based on a random sample of n=470 voters, predicted that independent candidate for the mayoral election will get

julsineya [31]

I have an expression

$\sigma = \sqrt{p(1-p)/n}$

floating around in my head; let's see if it makes sense.

The variance of binary valued random variable b that comes up 1 with probability p (so has mean p) is

$E( (b-p)^2 ) = (-p)^2(1-p) + (1-p)^2p = p(1-p)$

That's for an individual sample. For the observed average we divide by n, and for the standard deviation we take the square root:

$\sigma = \sqrt{p(1-p)/n}$

Plugging in the numbers,

$\sigma = \sqrt{.24(1-.24)/490} = 0.019 = 1.9\%$

One standard deviation of the average is almost 2% so a 27% outcome was 3/1.9 = 1.6 standard deviations from the mean, corresponding to a two sided probability of a bit bigger than 10% of happening by chance.

So this is borderline suspect; most surveys will include a two sigma margin of error, say plus or minus 4 percent here, and the results were within those bounds.

7 0

3 years ago