Answer:
4500
Step-by-step explanation:

380*10⁹=3.8*10²*10⁹=3.8*10¹¹
Answer:
The tree is 48 feet tall.
Step-by-step explanation:
Cross multiply. ⇒ 
5 times 8 equals 40, so 6 times 8 equals ___?
Solve. ⇒ 
The tree is 48 feet tall.
Answer:
-2.1
Step-by-step explanation:
x= 4/5
you put in 4/5 where x is supposed to be so you get: -2/5 - 4/5 + (-9/10)
-2/5 - 4-5 = -6/5
-6/5= -12/10
-12/10 + -9/10= -21/10 = -2.1