**7.50 x 10^10 + 3.20 x 10^9**

**Answer:**

78.2 x 10^9

**Step-by-step explanation:**

7.5 x 10^10+3.2 x 10^9

Factor the expression

(7.5 x 10 +3.2) x 10^9

multiply the numbers

(75+3.2)*10^9

add the numbers

78.2 x 10^9

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