help please and no troll answers for i will report it i also need the explanation to how u get to the answer please, thank you !!

  the marked choice is correct

Step-by-step explanation:

It usually works well to follow directions: use technology. The attachment shows the use of the technology I like for short regression problems. For longer problems, a spreadsheet program is a good choice.

_____

In this problem, it is easy to eliminate the nonsensical answers, so no real use of technology is necessary.

First of all, the y-value for x=0 needs to be near 48, eliminating the last two choices.

Second, the minimum of the function corresponds to a positive x-value, so the coefficient of the x-term must have opposite sign from the coefficient of the x^2 term. This eliminates the second choice, leaving the marked choice as the only viable one.

step-by-step explanation:

the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons