Step-by-step explanation:
= 2x - 9y + 4x + 11y
First of all combining like terms
So
= 2x + 4x - 9y + 11y
= 6x + 2y
Now putting values
= 6 (-2) + 2(4)
= - 12 + 8
= - 4
Step 1
find the volume of sand
volume of sand=8*20*3------------>Volume of sand=480 in³
Volume of sand in the new terrarium=10*24*h
where
h------------> is the <span>deep in the new terrarium
</span>remember that
the volume of sand is the same
so
10*24*h=480----------> h=480/(10*24)-----------> h=2 in
the answer is 2 in
Answer:
Part a) Daniel's age is 2 years
Part b) Kevin's age is 8 years
Step-by-step explanation:
<u><em>The question is </em></u>
Part a) How old is Daniel?
Part b) How old is Kevin?
Let
x ----> Kevin's age
y ----> Daniel's age
we know that
-----> equation A
----> equation B
Equate equation A and equation B
![4y=y+6](https://tex.z-dn.net/?f=4y%3Dy%2B6)
solve for y
![4y-y=6](https://tex.z-dn.net/?f=4y-y%3D6)
![3y=6](https://tex.z-dn.net/?f=3y%3D6)
![y=2](https://tex.z-dn.net/?f=y%3D2)
therefore
Daniel's age is 2 years
<em>Find the value of x</em>
substitute the value of y in any of the two equations
![x=4(2)=8\ years](https://tex.z-dn.net/?f=x%3D4%282%29%3D8%5C%20years)
![x=2+6=8\ years](https://tex.z-dn.net/?f=x%3D2%2B6%3D8%5C%20years)
therefore
Kevin's age is 8 years
The answer to this question is C