Answer:
Step-by-step explanation:
The goal to solving any equation is to have x = {something}. That means we need to get the x out from underneath that radical. It's a square root, so we can "undo" it by squaring. Square both sides because this is an equation. Squaring both sides gives you
![x^2=-3x+40](https://tex.z-dn.net/?f=x%5E2%3D-3x%2B40)
Get everything on one side of the equals sign and set the quadratic equal to 0:
![x^2+3x-40=0](https://tex.z-dn.net/?f=x%5E2%2B3x-40%3D0)
Throw this into the quadratic formula to get that the solutions are x = 5 and -8. We need to see if only one works, both work, or neither work in the original equation.
Does
?
and
![5=\sqrt{25}](https://tex.z-dn.net/?f=5%3D%5Csqrt%7B25%7D)
and 5 = 5. So 5 works. Let's try -8 now:
and
so
![-8=\sqrt{64}](https://tex.z-dn.net/?f=-8%3D%5Csqrt%7B64%7D)
-8 = 8? No it doesn't. So only 5 works. Your choice is the third one down.
Siamone has $65.32 + DAN
Dan has CARLY - $37.50
CARLY = $127.75
Plug Carly into Dan's equation...
$127.75 - $37.50 = $90.20
DAN = $90.20
Plug Dan into Siamone's equation
$65.32 + $90.20 = $155.57
Answer:
-18
Step-by-step explanation:
-15+6=-9
the absolute value of -9 is 9
and 9*-2=-18
Answer:
A cylinder with a base radius of 7cm and a height of 12 cm.
Answer:
24/60 = 2/5
Step-by-step explanation:
24/60
Divide both the numerator and denominator by a common factor, 6
4/10
Divide both the numerator and denominator by a common factor, 2
2/5