Answer:
6x + 2y
Step-by-step explanation:
remove the bracket and collect like terms
6x + 4y - 2y = 6x + 2y
Answer:
Step-by-step explanation:
<u>Area formula for equilateral triangle with side a:</u>
<u>The base area is:</u>
The three lateral surfaces have same sides of 10, 10 and 12.
<u>Find each surface area using heron's formula:</u>
- s = P/2 = (10 + 10 + 12)/2 = 16
- s - a = 16 - 10 = 6
- s - b = 6
- s - c = 16 - 12 = 4
<u>Total surface area is:</u>
Correct choice is C
She can cut 4 pieces from the ribbon.
Answer:
3x=-y+12
2x+3y=-6
collecting the like terms we have
3x+y=12
2x+3y=-6
to solve this simultaneous equation, we use substitution method
we make y the subject in equation one:
y=12-3x
then we put y=12-3x into 2x-3y=-6 in equation two
2x+3(12-3x)=-6
2x+36-9x=-6
-7x+36=-6
-7x=-6-36
-7x=-42
x=-42÷-7
x=6
then we put x=6 in y=12-3x:
y=12-3x
y=12-3(6)
y=12-18
y=-6