-12+2c=2*c-6:2*c-6=0. C-6=0 and c=6.
Step-by-step explanation:

therefore, 9 students haven't given their speech
Answer:150
Step-by-step explanation:Therefore, the answer to what divided by 15 equals 10 is 150. You can prove this by taking 150 and dividing it by 15, and you will see that the answer is 10.
(2+9)*f
= 11*f
The final answer is 11f~
Answer:4=log(x)
For logarithmic equations, logᵇ(x)=y is equivalent to b∧y=x such that x>0,b>0, and b≠1.
In this case, b=10, x=x, and y=4.