Answer:
10
Step-by-step explanation:
1 400 000 000 000 000 000 000 km = 1.4 * 10^21 km
c> 34-19
C> 15
40
2 • (3(5 + 2) - 1) =
Start with the innermost parentheses.
= 2 • (3(7) - 1)
Now do the multiplication inside the parentheses.
= 2 • (21 - 1)
Do the subtraction inside the parentheses.
= 2 • 20
= 40
there ya go
