Three times the sum of a number and four is twenty-one. find the number.

the number is

The answer to your question is: x = 3

Step-by-step explanation:

                                            3(x + 4) = 21

                                              x  + 4 = 21/3

                                             x + 4 = 7

                                            x = 7 - 4

                                            x = 3

n = 9/3 = 3

Step-by-step explanation:

Translating these words into symbolic statements:

3(n + 4) = 21.

Perform the indicated multiplication, obtaining:

3n + 12 = 21

Combine the constant terms:  3n = 9

Finally, solve this for n: n = 9/3 = 3

he can buy 4lbs. of live bait and 1lbs of natural bait

step-by-step explanation:

the answer is 13 cm