Answer:
A book is worth $1 and a DVD is worth $12.
Step-by-step explanation:
The equations (2 unknowns and two equations, d is for a DVD and b is for a book):
For David: 3d+4b=40
For Anna: d+6b=18
Now multiply the second equation with -3 and add to the first equation:
3d+4b=40
−3d−18b=−54
Combined equation: −14b=−14 and b=1 (means that each book is worth $1).
Now for DVD price, use the second equation:
d=18−6 or d=12 (means that each DVD is worth $12).
A book is worth $1 and a DVD is worth $12.
Answer:
27 after 81 is 243
Step-by-step explanation:
The pattern is that you multiply 3 each time.
Answer:
t = - 1/8
Step-by-step explanation:
t ÷ 5/12 = - 3/10
t × 12 ÷ 5 = - 3/10
12t/5 = - 3/10
12t × 10 = -3 × 5
120t = - 15
t = - 15/120
t = - 1/8
Thus, t divided 5/12 = - 3/10 => -1/8
<u>-TheUnknown</u><u>S</u><u>c</u><u>ientist</u>
Answer:
where is this from
Step-by-step explanation:
Answer:
depends on the subject ^-^
Step-by-step explanation:
