What is the sum of 4.9 × 102 and 6.8 × 103?

The sum is

Step-by-step explanation:

We want to add

The sum of these two numbers is:

This is the same as:

We rewrite 7290 in standard form to get;

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step-by-step explanation:

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first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.