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joja [24]
2 years ago
10

Answer the top one please.

Mathematics
1 answer:
daser333 [38]2 years ago
8 0

Step-by-step explanation:

f(x) =x2 +3X

f(-4 )= 16 +3(-4)

= 16 -12 =4

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Sharon has a coupon for $5 off light bulbs at Lowes. The light bulbs she wants cost $7.50 a package. How much money, m, will she
kykrilka [37]
Sharon would spend $2.50 for the light bulbs she wants.
7 0
3 years ago
5) Solve 9x = 7x + 12
Nikolay [14]

Answer:

X=6

Step-by-step explanation:

Move the variable to get 9x-7x=12

collect like terms to get 2x=12

divide to get 6

6 0
3 years ago
Read 2 more answers
For <img src="https://tex.z-dn.net/?f=e%5E%7B-x%5E2%2F2%7D" id="TexFormula1" title="e^{-x^2/2}" alt="e^{-x^2/2}" align="absmiddl
nevsk [136]
I'm assuming you're talking about the indefinite integral

\displaystyle\int e^{-x^2/2}\,\mathrm dx

and that your question is whether the substitution u=\dfrac x{\sqrt2} would work. Well, let's check it out:

u=\dfrac x{\sqrt2}\implies\mathrm du=\dfrac{\mathrm dx}{\sqrt2}
\implies\displaystyle\int e^{-x^2/2}\,\mathrm dx=\sqrt2\int e^{-(\sqrt2\,u)^2/2}\,\mathrm du
=\displaystyle\sqrt2\int e^{-u^2}\,\mathrm du

which essentially brings us to back to where we started. (The substitution only served to remove the scale factor in the exponent.)

What if we tried u=\sqrt t next? Then \mathrm du=\dfrac{\mathrm dt}{2\sqrt t}, giving

=\displaystyle\frac1{\sqrt2}\int \frac{e^{-(\sqrt t)^2}}{\sqrt t}\,\mathrm dt=\frac1{\sqrt2}\int\frac{e^{-t}}{\sqrt t}\,\mathrm dt

Next you may be tempted to try to integrate this by parts, but that will get you nowhere.

So how to deal with this integral? The answer lies in what's called the "error function" defined as

\mathrm{erf}(x)=\displaystyle\frac2{\sqrt\pi}\int_0^xe^{-t^2}\,\mathrm dt

By the fundamental theorem of calculus, taking the derivative of both sides yields

\dfrac{\mathrm d}{\mathrm dx}\mathrm{erf}(x)=\dfrac2{\sqrt\pi}e^{-x^2}

and so the antiderivative would be

\displaystyle\int e^{-x^2/2}\,\mathrm dx=\sqrt{\frac\pi2}\mathrm{erf}\left(\frac x{\sqrt2}\right)

The takeaway here is that a new function (i.e. not some combination of simpler functions like regular exponential, logarithmic, periodic, or polynomial functions) is needed to capture the antiderivative.
3 0
3 years ago
Find the missing angle.
cestrela7 [59]

Answer:

85 degrees

Step-by-step explanation:

The angles in a quadrilateral add to 360 degrees, so x+109+96+70=360.

This means that x=360-109-96-70=85 degrees

5 0
2 years ago
WILL GIVE BRAINLYLIST !!!!! IF UNDER 5 MINSSSS HELPThe cost of 10 cupcakes at a cake stand is $40. Which graph shows the cost of
andre [41]

Answer:

I have to say the first one sorry responded late  

GIVE BRAINIEST:

plz give me brainliest i almost got caught in class WHILE HELPING!!!

8 0
3 years ago
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