There are 7.5e38 stars in our galaxy. so far astronomers have mapped 0.27% of all of these stars.

1) how many stars have been mapped in our sky?

write answer like this example "5.23e45". round to three significant digits, "5.23"

  2.03E36

Step-by-step explanation:

The number mapped is the product of the total number and the fraction that are mapped:

  7.5E38 × .27E-2 = 7.5×.27 E (38 -2) = 2.025E36 ≈ 2.03E36

560

hope this : )

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15