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Feliz [49]
3 years ago
6

- f(x) = 4(x + 3)2 +1Find f(-9).​

Mathematics
2 answers:
Xelga [282]3 years ago
7 0

my answer is -24

what other i don't know

hope it will help you

Romashka-Z-Leto [24]3 years ago
6 0

Answer:

this function does not look right . . .as the parenthesis are being multiplied twice   . . .but as it is written it would be 623

Step-by-step explanation:

-f(x) = 4(9x+3)2 +1     find f(-9)

multiple (9x + 3) by 8    (which is the 4 and the 2 multiplied together)

8(9x + 3) + 1

72x + 24 +1     (distributing the 8)

72x +25           (adding like terms)

substitute -9 in for x

72(-9) +25         72(-9) = -648 +25

combine like terms -f(-9) = -623

but since it is a negative function you would divide both sides

solution:  f (-9) = 623

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Write the slip-intercept form of the equation of the line described
kompoz [17]

Answer:

1) y=⅚x -2⅓

2) y=8/3x -5

Step-by-step explanation:

<u>Point-slope form:</u>

y=mx+c, where m is the gradient and c is the y-intercept.

Parallel lines have the same gradient.

Gradient of given line= \frac{5}{6}

Thus, m=⅚

Susbt. m=⅚ into the equation,

y= ⅚x +c

Since the line passes through the point (4, 1), (4, 1) must satisfy the equation. Thus, substitute (4, 1) into the equation to find c.

When x=4, y=1,

1= ⅚(4) +c

1 =  \frac{20}{6}  + c \\ c = 1 -  \frac{20}{6}  \\ c = 1 - 3 \frac{1}{3}  \\ c =  - 2 \frac{1}{3}

Thus the equation of the line is y =  \frac{5}{6} x - 2 \frac{1}{3}.

The gradients of perpendicular lines= -1.

Gradient of given line= -⅜

-⅜(gradient of line)= -1

gradient of line

= -1 ÷ (-⅜)

= -1 ×(-8/3)

= \frac{8}{3}

y =  \frac{8}{3} x + c

When x=3, y=3,

3 =  \frac{8}{3} (3) + c \\ 3 = 8 + c \\ c = 3 - 8 \\ c =  - 5

Thus the equation of the line is y =  \frac{8}{3} x - 5.

4 0
3 years ago
A
Elden [556K]

The graph is shown in the attached image.

8 0
2 years ago
If Keira spends $45 on petrol, 1/ 9 of the money on other items and 1 /5 of the money on clothes. How much money does she spend
gogolik [260]

Answer:

The money Keira spent on food is $31.

Step-by-step explanation:

Total money spent by Keira = $45

Things Keira spent money on:

1. Clothing

2. Food

3. Other items

Money spent on Clothing = 1/5 of total money

= 1/5 x $45

Money spent on Clothing = $9

Money spent on Other Items = 1/9 of total money

= 1/9 x $45

Money spent on Other Items = $5

Money spent of on Food = Money spent - (Money spent on clothing + other items)

Money spent on food = 45 - (9+5)

= 45 - 14

Money spent on food = $31

4 0
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Which histogram represents a data set with a mean of 4.5 and a standard deviation of 1.7?
AVprozaik [17]

Answer:

that would be the third one

Step-by-step explanation:

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When system of equations solved graphically, the solutions are points of interceptions, So here, the solution is the point of interception (0,-5).

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3 years ago
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