Answer:

Step-by-step explanation:
For each right-angled triangle:

Because 
we have an equation

multiplying both sides by x, we get 
dividing both sides by 0.4 and 
using calculator, we divide 12 by 0.4
and finally x=30
Answer:
X^2+3X-10
Step-x^2by-step explanation:
Answer:
b and e
Step-by-step explanation:
I think the answer would be b