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shutvik [7]
3 years ago
15

Given the function f(x)=-2x^2+4x-7, find f(-4)

Mathematics
2 answers:
jeka57 [31]3 years ago
7 0
Let's begin by evaluating f(x) using the value of 3:    f(x) = 2x2 - 4x - 4 (original function)    f(3) = 2(3)2 - 4(3) - 4 (plugging in 3 for x)    f(3) = 2 (computed result) Now let's evaluate g(x) using the value of 3:    g(x) = 4x - 7 (original function)    g(x) = 4(3) - 7 (plugging in 3 for x)    g(x) = 5 (computed result) Finally, we'll sum our results:    (f + g)(3) = 2 + 3 (add f(3) and g(3))    <span>(f + g)(3) = 5 (final answer)</span>
AveGali [126]3 years ago
5 0
Please see picture attached.

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Question 27 of 28<br> 1 Point<br> What is the slope of the line shown below?<br> (3,-2)<br> (2,-4)
Gwar [14]

Answer:

The slope is 2

Step-by-step explanation:

To find the slope given two points, we use the formula

m = (y2-y1)/(x2-x1)

   = (-4--2)/(2-3)

   = (-4+2)/(2-3)

   = -2/-1

   = 2

6 0
3 years ago
Help me! Need answers to questions ii and iii please. Thanks x
Debora [2.8K]
Ii.First ,expand: 5(x-2)=32
5x-10=32
bring 10 to the other side (add it to 32)
5x=42
divide both sides by 5 to get x
x=42/5
x=8.4

iii.Expand 5+2(x+3)=21
5+2x+6=21
bring 5 and 6 to the other side
2x=21-5-6
2x=10 divide both sides by 2
x=5
6 0
3 years ago
Marie gets paid $ 2,000 monthly and a commission of 50 dollars for each sale she makes. Write an expression that represents her
denpristay [2]

Answer:

2000+(50× x)

Step-by-step explanation:

The certain salary is 2000 but we do not know how much sale where made so the amount is placed as x inwhich will be multiples by 50 then added to 2000 to get total

8 0
3 years ago
The ratio of laptop to desktop computers at a middle school. Is 8 to 6. If there are 462 desktop computers, how many computers i
Aleksandr-060686 [28]

Answer:

1078

Explanation:

For this you can use a proportion to solve. So first we set up the proportion as  laptop over desktop is equal to "<em>l</em>" over total desktop computers. Let <em>l</em> be the total amount of laptops which is what we must first solve for.

\frac{8}{6}=\frac{l}{462} \\

Then we cross multiply.

6l=3696\\

Now we can solve it as a regular algebra problem,

\frac{6}{6}l = \frac{3696}{6}\\  l=616

Now that we know how many laptop computers there are we can find the total number of computers in the school. We simply add the total number of desktop computers to the total number of laptop computers.

462+616=1078

And that is the answer. 1078.

7 0
3 years ago
Please explain, too! Thank you :) ​
Nadya [2.5K]

Answer:

∠POS = 128°

Step-by-step explanation:

Angles on a straight line always add up to 180°

Therefore:

∠POS + ∠POQ = 180°  (as they are the angles on line SOQ)

∠POS + 52° = 180°

∠POS = 180° - 52°

∠POS = 128°

4 0
3 years ago
Read 2 more answers
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