Did i set this equation up correctly?

69.2 amu

Explanation:

Atomic mass of Gallium

; (68 × 60.1) + (70.9 × 39.9)

; In which this gives you...6915.71

;Then divide the value with the total percentage(100)

;6915.71 ÷ 100 = 69.1571

Atomic mass of Gallium = 69.2 amu

Yes :)

Explanation:

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indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.