Answer:
All except for D
Step-by-step explanation:
write down the facts. Form an equation. Organize into a table. List potential formulas. Draw a diagram
Answer:x
x=
√
3
/3
,
−
√
3
/3
Step-by-step explanation:
its that because idk what kind of question is that
Let x is Casey's sister age.
<span>3 years ago:
</span><span>Casey was twice as old as his sister: 2a - 3
Now:
</span><span>he is 5 years older than his sister: a + 5
2a - 3 = a + 5
subtract a to both sides
2a - 3 -a = a + 5 - a
simplify
a - 3 = 5
add 3 to both sides
a - 3 + 3 = 5 + 3
simplify
a = 8
His sister age is 8 years old now.
</span>Now:
he is 5 years older than his sister: a + 5 = 8 + 5 = 13
<span>
proof:
so 3 years ago,
his sister age: 8 - 3 = 5
Casey age 3 years ago:
13 - 3 = 10 (</span>C<span>asey was twice as old as his sister 3 years ago</span>)
<span>
Answer:
Casey is 13 years old now.
</span>
To solve for x^2 - 40 = 9, take the square roots of both sides and solve.
The answer is x = 7, -7.
