2 years ago

I have a lot of khan questions so any help would be appreciated 3(−2a−4)+3a

Mathematics

1 answer:

nata0808 [166]2 years ago

3 0

Answer:

-3a-12

Step-by-step explanation:

3(-2a-4)+3a

-6a-12+3a

-6a+3a-12

-3a-12

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A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 45 minutes. Supp

riadik2000 [5.3K]

Answer:

$H_0:\mu =45\\\\H_a:\mu\geq 45$

Step-by-step explanation:

Since we have given that

A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 45 minutes.

Since we need to carry out a hypothesis test whether he can refute the claim.

We always take the alternate hypothesis such that it should satisfy the given statement.

And the null hypothesis can be equal to mean or other than that is given in alternate hypothesis.

So, hypothesis :

$H_0:\mu =45\\\\H_a:\mu\geq 45$

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3 years ago

13x+5y=90 what is x? what is y?

Leona [35]

Answer:

X=-5y/13+90/13, Y=-13x/5+18

Step-by-step explanation:

You need to solve the equation for X and Y.

Solving for X:

13x+5y=90

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Divide by 13: x=-5y/13+90/13

For Y:

13x+5y=90

Subtract 13x: 5y=-13x+90

Divide by 5: y=-13x/5+90/5

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