Length=1.7cm, width =4.3cm, perimeter=?

According to the terms, used by you, we can guess the figure is rectangle. 
We know, Perimeter of a rectangle = 2 (l + w)
p = 2 (1.7 + 4.3)
p = 2(6)
p = 12 cm

In short, Your Answer would be 12

Hope this helps!

P=2L+2w
P=(2×1.7)+(2×4.3)
↓ ↓
P= 3.4. + 8.6
P=12.0

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!