Which of the following is an example of an identity?
1) x^2+2x+8=(x+2)(x+4)
2) 2x(x-3)+5x-15=(2x+5)(x-3)
3) x^2+9=(x+3)^2
4) x^3+8=(x+2)(x^2+4)
Pleeeaas help mee:( I’ve been struggling all day

Blank × 10-3 is 2,000 times greater than 1.9 × 10-6. it is also blank times greater than 9.5 × 10-4.

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

Taking algebra two apex courses and need with these questions