2 years ago

I NEED HELP PLEASE!

Mathematics

1 answer:

Gekata [30.6K]2 years ago

8 0

A aaaaaaaaaaaaaaaaaaaaaaaaaa

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What is the axis of symmetry for f(x) = -3x2 + 18 - 7

solong [7]

The vertex form:

$y=a(x-h)^2+k\\\\(h,\ k)-vertex$

The axis of symetry is x = h.

$y=ax^2+bx+c\to h=\dfrac{-b}{2a}$

We have

$f(x)=-3x^2+18x-7\to a=-3,\ b=18,\ c=-7$

Substitute:

$h=\dfrac{-18}{(2)(-3)}=\dfrac{-18}{-6}=3$

<h3>Answer: x = 3</h3>

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2 years ago

Richard works from 11:00am to 3:00am dinner break is 75% of the way though work shift what time is his dinner break

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Answer:

12:00 PM

Step-by-step explanation:

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2 years ago

Step 1: Use equations to solve problems.

Crazy boy [7]

Answer:

Step-by-step explanation:

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2 years ago

I’m stuck on these two questions

torisob [31]

7) -5-x=0
x=-5
8) 4x-36=0
4(x-9)=0
x-9=0
x=9

8 0

2 years ago

I need help with questions 1,2, and 3. Would gratefully appreciate it (:

motikmotik

Answer:

Step-by-step explanation:

(2):

First let's organise the data:

33 miles ... x mph ... 4h - downstream

33 miles ... y mph ... 7h - up the stream

x = 33/4 = 8.25 mph

y = 33/7 = 4.71 mph

(3)

P(x) = $x^2 - 2x - 3$

To find the amount of key rings sold when the profit is 5000$ we have to equate P(x) with 5, because in the problem the profit of the key rings is displayed in terms of thousands.

$x^2 - 2x - 3 = 5\\x^2 - 2x - 8 = 0\\x_1 = 4, x_2 = -2$

Since the number of keyrings sold has to be positive the only answer is 4 thousand key rings.

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3 years ago