Answer:
112/125
Step-by-step explanation:
If we know all 25 are in at least one foreign language class then we can assume that exactly 4 of the 18 kids in French only take French to add up to 25 and this means that the 14 left take both classes. Now we can create three fractions for each case which are 7/25 (Spanish only) 4/25 (French only) and 14/25 (Both) and we can know say that if he goes down the route of getting a Spanish only as his first he needs one of the 18 other students the chances of this happening are 7/25 * 18/25 = 126/625 the same thing is done with the French only and we get 4/25 * 21/25 = 84/625 and then we have the possibility of just getting a student that does both which is 14/25 or 350/625. now we add them all together to get 560/625 which is simplified to 112/125.
Hope this helps please mark brainliest :)
To figure out where each crosses the x and y axis simply plug in 0 for y and x respectively.
x intercept is where y = 0
y intercept is where x = 0
a) x intercept
ax + b(0) = c
c = ax
x = c/a so the x intercept is (c/a, 0)
y intercept
a(0) + by = c
0 + by = c
y = c/b, so the y intercept is (0,c/b)
Jus repeat the process for part b
b) x intercept
ax - 0 = c
x = c/a, so the x intercept is the same, (c/a , 0)
y intercept
0 - by = c
y = -c/b, so the y intercept is different from before (0, -c/b)
You know when a squared number is ration when it is a perfect square like the square root of 25 is 5. The square root can't be a decimal.
Step-by-step explanation: 8x+2y=0 move variabe to the right
next divide both sides by 2 and that gives you 2y =-8x to get the answer that is y= -4x
answer
-625
foil
first foil (20 + 15i)(15i - 20) to get
(20 * 15i) + (20 * (-20)) + (15i * 15i) + (15i * (-20))
= (300i) + (-400) + (225
) + (-300i)
combine like terms
combine the i terms together to get
(300i) + (-400) + (225
) + (-300i)
300i - 400 + 225
- 300i
= -400 + 225![i^{2}](https://tex.z-dn.net/?f=i%5E%7B2%7D)
substitute -1 into i^2
remember that i =
so
= -1, and substitute this into -400 + 225i^2
-400 + 225i^2
= -400 + 225(-1)
= -400 -225
= -625