Step-by-step explanation:
We can see from the image that z and 20° degrees are complementary, meaning they have a sum of 90°. From this, z = 70°. Hope this helps!
2x + 3 + x = 39
3x + 3 = 39
3x = 36
x = 12
One tank holds 12 gallons
The other tank holds 27 gallons
15x+$38.50=$100
x being however much she can spend on each friend
x= $12.30 if you need that too
