Question

Hey guys please help me tomorrow is my test......
Please solve this problems with steps
Q.1)
Calculate the no. Of significant figure.

1.0076, 1000, 0.00900, 2007

Q.2) jee question.

The sum of the numbers 436.32 , 227.2 and 0.301
in appropriate  significant  figures is
A) 6663.821
B) 664
C) 663.8
D) 664.8

Q.3)neet question
The solid angle subtended by total surface area of sphere at centre  is
A)4[ ]
B)2 [ ]
C)[ ]
D)3 [ ]

Answer 1

here is your answer.... I don't know about 3rd question