Answer: 30 boys
Step-by-step explanation:
Boys:Girls
3 : 1
Let no. of girls =x
⇒ no. of boys =3x.
⇒ no. of students in class =4x
=
4/3×3x
= 4
/3 ×no. of boys
40=4/3* no.of boys
40* (3/4)=no.of boys
30=no of boys
Answer:
(2x-5)feet
Step-by-step explanation:
The area of the rectangular garden A = Length × Width
Given the area A(x) = 2x² - 21x + 40
And the width =x-8 feet
To get the length, we will simply factorise the area function as shown;
You will just factorise the area
Factorizing 2x² - 21x+40
2x² − 21x + 40
2x² -16x - 5x + 40
2x(x - 8) -5(x - 8)
=(2x−5)(x−8)
Hence the length of the garden is
(2x-5)feet
Answer:
15 m/s
Step-by-step explanation:
Velocity is the derivative of position:
v(t) = s'(t) = 24 +6t -3t^2
v(3) = 24 +3(6 -3·3) = 15
At t=3 seconds, the velocity of the body is 15 m/s.
Answer:
2
Step-by-step explanation:
What are you trying to do? inverse or factor or something like that?