6r+70=-2(35+3r)
multiply the bracket by -2
(-2)(35)=-70
(-2)(3r)=-6r
6r+70=-70-6r
move -70 to the left side
sign changes from -70 to +70
6r+70-70=-70-70-6r
6r=-70-70-6r
move-6r to the left side
6r=-140-6r
move -6r to the other side
6r+6r=-140-6r+6r
12r=-140
divide both sides by 12
12r/12=-140/12
r=-140/12
reduce- by dividing by 4
-140/4=-35
12/4=3
Answer:
r= -35/3 and r=-11 2/3
Cubic volume=l³
l³= 1728
l= 12 feet
the aquarium is cubic shaped=> all l are equal
one side is a square with l= 12 feet
area= l²= l•l= 12•12= 144 feet²
Answer:
3
Step-by-step explanation:
Answer:
3x+8y=-5-equatin.1
-2x+2y=18-equation.2
now,
subtracting both equation.1 by equation.2,then
3x+8y=-5
-8x+8y=72
+ - -
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Congruent means same so the equation is
5x+24=9x-17
Subtract 5x on both sides
24=4x-17
Add 17 to both sides
41=4x
Divide by 4
10.25
