What are

What are the four terms between 4 and 19?

Correct answer:

a₂ =  7
a₃ =  10
a₄ =  13
a₅ =  16

Step-by-step explanation:

$$\begin{gathered} a_1=4 \\ {a}_6=19 \\ {a}_n=a_1+d\cdot (n-1) \\ {a}_6=a_1+5d \\ d={\displaystyle \frac{a_6-a_1}{5}}={\displaystyle \frac{19-4}{5}}=3 \\ {a}_2=a_1+d=4+3=7 \end{gathered}$$

$a_3=a_2+d=7+3=10$

$a_4=a_3+d=10+3=13$

$a_5=a_4+d=13+3=16$

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