suppose that the function f(x) = 5.32 0.80x represents the cost of mailing an object that weighs x pounds. how much would it cost to mail an object that weighs 36 pounds?
Lets:
x=number of boys.
y=number of girls
We can suggest this system of equations:
x/y=11/13 ⇒x=11y /13
x=y-72
We can solve this system by substitution method
(11y/13)=y-72
lower common multiple=13
11y=13y-936
11y-13y=-936
-2y=-936
y=-936/-2
y=468
x=11y/13=11(468)/13=396
There are 396 boys and 468 girls in this school,
number of kids=number of boys + number of girls.
number of kids=396+468=864
Answer: there are 864 kids in this school.
1.a
2.c
When u plug in what the x variable is in each equation, you figure out what y equals to.
1.y=(2)^3 +1 so y=8+1 so y=9
2.y=(-2)^3 +1 so y=-8+1 so y=-7
It would be the second one.
4(2x^2 + 5y^2)(2x^2 - 5y^2)