Please help me I'm mostly struggling with the part that says x-3 so please help and if you can give me an explanation I will really appreciate it

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Juliana says that she can use the patterns of equivalent ratios in the multiplication table below to write an infinite number of ratios that are equivalent to 6: 10. which statement explains whether juliana is correct? she is correct because she can multiply 6 and 10 by any number to form an equivalent ratio. she is correct because 6: 10 can be written as 1: 2 and there are an infinite number of ratios for 1: 2. she is not correct because the multiplication table does not include multiples of 10. she is not correct because 6: 10 is equivalent to 3: 5 and there are only 9 ratios in the multiplication table that are equivalent to 3: 5.

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5