(4x-7y)(4x+7y)
4x times 4x= 16x^2
-7y times 7y= -49y^2
2.3 x 10^-3 * 4.2 x 10^2 =
.0023 * 420 =
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0.966
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This is how you solve it..
95/n=n
You could put 5 in and get 95/5=19.
Your answer is

because the numbers raised to negative powers must be flipped over the divisor to become positive. Then, when multiplying 2 and z, you add their exponents.
B is true; pi= ~3.14. 3+4 is equal to 7, so because pi is greater than 3, pi+4>7