Answer:
4.5 A
Step-by-step explanation:
VA = W
1000 W / 220V = 4.545454... A
There are 30 students in class
<em><u>Solution:</u></em>
Let "x" be the total number of students in class
Given that,
The number of boys represents 54% of the class
Therefore,
Number of boys = 54 % of total number of students
Number of boys = 54 % of x
![\text{Number of boys } = \frac{54}{100} \times x\\\\\text{Number of boys } = 0.54x](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20boys%20%7D%20%3D%20%5Cfrac%7B54%7D%7B100%7D%20%5Ctimes%20x%5C%5C%5C%5C%5Ctext%7BNumber%20of%20boys%20%7D%20%3D%200.54x)
Given that, There are 14 girls in a class
Therefore,
Number of girls = 14
Thus we get,
Number of boys + number of girls = total number of students
0.54x + 14 =x
x - 0.54x = 14
0.46x = 14
Divide both sides by 0.46
![x = 30.43 \approx 30](https://tex.z-dn.net/?f=x%20%3D%2030.43%20%5Capprox%2030)
Thus there are 30 students in class
F(x)= 2/(x+1) and g(x)= -x2-12 => f(-7)= ? , g(2.5)= ?, g(f(- 0.5))= ?
In the expression of the function f(x) we will replace instead of x the number in bracket (-7) => f(-7) = 2/(-7+1)= 2/-6 = - 1/3
In the expression of the function g(x) we will replace instead of x number in bracket (2.5) => g(2.5) = - (2.5)squared -12= - 6.25 -12= - 18.25
Expression f(g(x)) or g(f(x)) is multiplication (composition) of the reflecting of functions f and g. We will do this in the following way => g(f(x))= g(2/(x+1))= -(2/(x+1))2 - 12= -(4/(x+1)2) -12= -4-12(x+1)2/(x+1)2=> we will replace instead of x the number in bracket (-0.5) or (-1/2) => g(f(-1/2) = -4-12((-1/2)+1)2/ ((-1/2+ 1)2= -4-12(1/2)2/(1/2)2=-4-12*(1/4)/(1/4)= (-4-3)/(1/4)=-28
Eaisier way => f(-1/2)=2/((-1/2)+1)=2/(1/2)= 4 g(4) -(4)2-12 = -16-12= -28
Answer:
If you don't agree or there's an error, let me know so I can edit.
Step-by-step explanation:
f(x) = x⁴ + 2
differentiate
f(x) = 4x³ + 0 =0
x(4x²) = 0
at x= 0 f(x) = 0 points = (0,0)
at x= 1. f(x) = 3 points = (4,3)......