Question

10 mm = 1 cm
10 cm = 1 decimeter (dm)
10 m = 1 decameter (dam)
.
10 dm = 1 m
10 dam = 1 hm
10 hm = 1 km​

Answer 1

Answer:

Answer is :

Q. If 102y = 25, then 10-y equals:

(a) -1/5, (b) 1/625, (c) 1/50, (d) 1/25, (e) 1/5

Solution:

102y = 25

(10y)2 = 52

10y = 5

1/10y = 1/5

10-y = 1/5

Answer: (e)