1. Hoover Dam spans the Colorado
River on the Nevada-Arizona state
line. For its construction, the federal
government purchased 21,670,000
pounds of gates and valves. Which
number is the BEST estimate of this
amount?
A. 2 x 10^7
B. 2 x 10^8
C. 3 x 10^7
D. 3 x 10^8

BEST estimate of this  amount is . Correct option A. 2 x 10^7 .

Step-by-step explanation:

Here we have , Hoover Dam spans the Colorado  River on the Nevada-Arizona state  line. For its construction, the federal  government purchased 21,670,000  pounds of gates and valves. We need to find BEST estimate of this  amount . Let's find out:

21,670,000  pounds

⇒ 21,670,000  pounds

⇒

⇒

⇒

⇒

⇒

Now, Rounding of 2.167 we get 2  ,So

⇒

Hence ,  BEST estimate of this  amount is . Correct option A. 2 x 10^7 .

john earns $14.00 for two hours of work.

3; 9 is 8 to -4

step-by-step explanation: