Answer:
Not sure but I believe it is A
Step-by-step explanation:
Answer:
t:

meaning any number can substitute t and it would be the same answer.
A = 1/2 bh
A = 1/2 (21)(8)
A = 1/2 (168)
A = 84
24-3x=-27
-24 -24
-3x=-51
— —
-3 -3
X=17
When Serena is 10, her mom is 3*10=30. Her mom is 20 years older than Serena.
If her mom's age divided by half is equal to Serena's, then she will be twice as old as Serena.
20 + 20 = 40
20 * 2 = 40
Serena will be 20, her mom will be 40.