Me! can someone me solve these problems.

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?