Write the missing reasons. Assume that each variable represents any real number. Prove: (a + b) + (-b) = a
Proof:
1. a + b is a real number
2. -b is a real number
3. (a + b) + (-b) = a + [b + (-b)]
4. (a + b) + (-b) = a + 0
5. (a + b) + (-b) = a

1.
2.
3.
4.
5.

answer;

the correct answer

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x equals 1

step-by-step explanation:

f(4)=f(×)

x=1

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)

an = 22 + (n-1) *6

110 seats

step-by-step explanation:

an=a1+(n-1)(d)

a1 = 22   this is the first item in the sequence

d =6   this is how the sequence goes up

a)   an = 22 + (n-1) *6

b) a12 = 22 + (12-1) *6

    a12 = 22+11*6

  a12 = 22 +88

  a12 = 110