How do you find area like in this question i know already it’s d though i just need figuring this out?

Find the area of the whole rectangle and find the area of the not shaded part and then subtract them to find the are of the shaded part.

Area of whole: 10 * 6 = 60 cm²
Area of non shaded: 6 * 2 = 12 cm²

Area of shaded part:

60 - 12 = 48 cm²

Hope this helps :)

The length of the entire rectangle is 10, and its width is 6. The length of the smaller rectangle is 6, and its width is 2. If you multiply 10 by 6, you get 60 for the area of the entire rectangle. But since it just wants the shaded region, you now need to find the product of the non-shaded rectangle and then subtract it from the whole rectangle to get the area of the shaded region. 6 x 2 = 12
60 - 12 = 48. Sorry if it sounded confusing let me know if you need simplified, and I hope this helps. 

Number 40 is a rational number glad i could