Answer:
12+# OR 12+x
Step-by-step explanation:
Increased by 12 means plus 12. The word "is" in equations is an equal sign. So far, you have 2n+12. On the other side of the equal sign, you have 31 less than 3 times a number.
According to Trigonometry,
3✓3xy
✓3^2×3x^2y^2
✓3xy ✓3
80
I just took the test :)
