Kuri spent a total of $68 on trading cards. His collection contains two types of cards. A pack of trading card A $4 and a pack o
2 answers:
Answer:
Kuri purchased 3 packs of trading card A, and 8 packs of trading card B.
Step-by-step explanation:
1. First name the variables:
a = number of packs of trading card A
b = number of pack of trading card B
2. As a pack of trading card A costs $4, a pack of trading card b costs $7 and As Kuri spent a total of %68 on trading cards, the first equation is:
3. As Kuri purchased a total number of 11 packs, the second equation is:
4. Solve Eq.2 for a:
5. Replace Eq.3 in Eq.1 and solve por b:
6. Replace the value of b in Eq.3:
Therefore Kuri purchased 3 packs of trading card A, and 8 packs of trading card B.
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ANSWER
3200 m²
EXPLANATION
Peter wants to build a fence around a rectangular field, except for one side because the river is there,
So, the total perimeter of the fence is,
And this is equal to 160 m. Solving for L,
The area of this field is,
Replace L with the expression we found from the perimeter,
The area is given by a quadratic function whose leading coefficient is negative, which means that the graph is a downward parabola and, therefore, the vertex is the maximum value of the area.
The x-coordinate of the vertex is given by,
In this case, x is W, a = -2, and b = 160, so the width of the field for the maximum area is,
And the length when W = 40 is,
And the area is,
Hence, the largest area of Peter's farm that can be fenced is 3200 square meters.
Answer:
0.08(50h)
Step-by-step explanation:
Since, it took 50h to repair the computer so, 0.08(50h) represents the amount of tax Deborah has to pay. Which is 8% of 50h.