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3 years ago

F(x)=3x 2 +6x−18Find f(10)

Mathematics

1 answer:

Aliun [14]3 years ago

6 0

Answer:

342

Step-by-step explanation:

To find f(10), simply substitute x for 10, resulting in 300+60-18 = 342

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Jill has to go to the post office before she drops her 3 children off at the elementary school. She is going straight home after

Scilla [17]

Answer:

Step-by-step explanation:

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3 years ago

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\frac{1}{5}k-9=\frac{3}{5}k-7

Oksi-84 [34.3K]

let start by multiplying both sides by the LCD of all denominators, in this case that'd be 5, to do away with the denominators.

$\bf \cfrac{1}{5}k-9=\cfrac{3}{5}k-7\implies \stackrel{\textit{multiplying by }\stackrel{LCD}{5}}{5\left( \cfrac{1}{5}k-9 \right)=5\left( \cfrac{3}{5}k-7 \right)}\implies k-45=3k-35 \\\\\\ -45=2k-35\implies -10=2k\implies \cfrac{-10}{2}=k\implies -5=k$

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3 years ago

What’s the cot(180°) + (cos(180°)/sin(180°))

KatRina [158]

Answer:

the answer is 'undefined'

Step-by-step explanation:

Cot is defines as (cos x)/(sin x)

So we can rewrite our expression as...

(cos 180°)/(sin 180°) + (cos 180°)/(sin 180°)

2(cos 180°)/(sin 180°)

Cos 180° = 1, sin 180° = 0 (you get these from the unit circle)

so we have

2(1/0) = 2/0, which is undefined, because we don't divide by zero

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3 years ago

If x and 60 make a right angles find the size of x.

elena55 [62]

Answer:

30 degree

Step-by-step explanation:

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3 years ago

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At the movie theatre, child admission is S5.20 and adult admission is $8.30. On Tuesday, 156 tickets were sold for a total sales

Annette [7]

Answer:

So, 89 Adult tickets were sold.

Step-by-step explanation:

So, we first name our variables, say, a for number of adult tickets, and c for child tickets.

Then we write our system of equations, first the total $ sale:

5.2c + 8.3a = 1087.10

Then we write the 2nd equation, the total number of tickets:

c + a = 156

Now, we can solve the system:

We do have different methods, let's to by subsitution.

make some change to the 2nd equation, to make c the subject: c = 156 - a

Now we plug that into the 1st equation:

5.2(156 - a) + 8.3a = 1087.10

811.2 - 5.2a + 8.3a = 1087.10

811.2 + 3.1a = 1087.10

3.1a = 275.9

a = 89

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3 years ago