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VARVARA [1.3K]
3 years ago
6

Find f(-2) when f(x)=2x^2+5x-4

Mathematics
1 answer:
never [62]3 years ago
6 0

Answer:

-6

Step-by-step explanation:

f(x)=2x^2+5x-4

Let x= -2

f(-2)=2*(-2)^2+5(-2)-4

     = 2 (4)+5(-2)-4

     = 8 -10 -4

     = -6

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100 students take a course pass/fail. If they pass they get 4 points towards their GPA, if they fail they get 0. If 90 students
goldenfox [79]
Given:
100 students:
pass = + 4
fail =+ 0

90 students passed: 90 * 4 = 360
10 students failed: 10 * 0 = 0

mean: 360 / 100 = 36

standard deviation: 
36 - 4 = 32 ⇒ 32² = 1,024 * 90 = 92,160
36 - 0 = 36 ⇒ 36² = 1,296 * 10 = 12,960

92,160 + 12,960 = 105,120
105,120 / 100 = 1,051.20 ⇒ variance

Standard deviation = √1,051.20 = 32.42

4 0
4 years ago
“and” compound inequalities: 10<2+4x<20
Sav [38]

Answer:

2 < x < 4.5

Step-by-step explanation:

10<2+4x<20

We need to isolate x

Subtract 2 from all sides

10-2<2-2+4x<20-2

8<4x<18

Divide all sides by 4

8/4<4x/4<18/4

2 < x < 9/2

2 < x < 4.5

6 0
4 years ago
Evaluate <br> h(x) = 17+ x/6<br> H(-18)=
yan [13]
The answer is 14

-18/6 is -3. add that to 17 and you get 14.
7 0
3 years ago
A clerk earns $12 an hour. How much does the clerk earn for p hours of work?
Montano1993 [528]

Answer:

You can't do this without knowing the number of hours, but you can write an equation. The equation would be 12p. P means the number of hours they worked and 12 stands for how much they earn each hour. Therefore you would multiple both of them together.

5 0
3 years ago
Patel is solving 8x2 + 16x + 3 = 0. Which steps could he use to solve the quadratic equation? Select three options.
Nataly [62]
8(x2 + 2x + 1) = –3 + 8
x = –1 Plus or minus StartRoot StartFraction 5 Over 8 EndFraction EndRoot
x = –1 Plus or minus StartRoot StartFraction 4 Over 8 EndFraction EndRoot
8(x2 + 2x + 1) = 3 + 1
8(x2 + 2x) = –3
3 0
3 years ago
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