3 years ago

If f(x) = -7x + 5x2 + 10, what does f(-2) equal?

Mathematics

1 answer:

Iteru [2.4K]3 years ago

6 0

Answer:

Step-by-step explanation:

f(x) = -7x + 5x^2 + 10

f(-2) = -7(-2) + 5(-2)^2 + 10

= 14 + 20 + 10

= 44

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A taxi ride costs $4, plus an additional $3 per mile. What's the equation? (mx+b)

cestrela7 [59]

Answer:

3x+4

Step-by-step explanation:

3 dollars per mile = 3x

plus 4 dollars for taxi ride.

6 0

3 years ago

X + 4y = -24 5x + 3y = -35

Salsk061 [2.6K]

Answer:

$(-4,-5 )$

Step-by-step explanation:

You are looking for the point of intersection of these two functions.

Substitution:

This are now your formulas

$\left \{ {{x=-4y-24} \atop {5x+3y=-35}} \right.$

You are going to substitute x, so you can solve for y

$5(-4y-24)+3y=-35$
$-20y-120+3y=-35$
$-17y=85$
$y=-5$

Now you are going to substitute y to find x

$x=-4(-5)-24$
$x=20-24$
$x=-4$

Now lets check if it is correct

$-4+4(-5)=-24 :)$
$5(-4)+3(-5)=-35 :)$

So it is true, making (-4 , -5) your point of intersection.

hope it helps

5 0

3 years ago

I need help with this and if u are able to explain how it works that would be awesome but if you don't wanna explain that's perf

Katyanochek1 [597]

I'd go with the first option (2,-2.5) because the answers you get from solving the equation is

x = 9/5

y = -14/5

The x would round up to 2 and the y would round down to -2.5

5 0

4 years ago

What is 9+6(2^2+4) (its an exponent)

yuradex [85]

57
2^2=4
4+4=8
6*8=48
48+9=57

4 0

4 years ago

PLSSSSSS help What is the slope and the y -intercept and meaning

saveliy_v [14]

Answer:

$y=20x+45$

Step-by-step explanation:

'y' equals the total amount of money that the customer will pay.

"20x" represents the $20 per hour.

The '+45' represents the flat fee.

Brainilest Appreciated.

8 0

4 years ago