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SSSSS [86.1K]
3 years ago
12

Evaluate the expression 3.14(a2 + ab) when a = 3 and b = 4. (Input decimals only, such as 12.71, as the answer.)

Mathematics
2 answers:
GenaCL600 [577]3 years ago
6 0
3.14(3^2 +3(4)
3.14(9+12)
3.14(21)
65.94
Leokris [45]3 years ago
5 0
Substitute a and b and solve

3.14• (3•3+3•4)= 3.14• 21= 65.94
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Kayaks rent for $35 per day. Which expression can you use to find the cost in dollars of renting 3 kayaks for a day?
Murrr4er [49]

Answer:

$105

Step-by-step explanation:

assuming that it costs $35 dollars for renting 1 kayak per day:

3 * 35 = k   3 is for the # of kayaks and 35 is the cost

105 = k    multiply 35 w/ 3 to get the answer

6 0
3 years ago
2/3 (12x-9) i need help on this
schepotkina [342]

Answer:

8x−6

Step-by-step explanation:

Hope this helps!

6 0
3 years ago
Read 2 more answers
A rectangular storage container with an open top is to have a volume of 10 m3. the length of this base is twice the width. mater
BartSMP [9]
Refer to the diagram shown below.

The volume of the container is 10 m³, therefore
x*2x*h = 10
2x²h = 10
h = 5/x²        (1)

The base area is 2x² m².
The cost is $10 per m², therefore the cost of the base is
(2x²)*($10) = 20x²

The area of the sides is
2hx + 2(2xh) = 6hx = 6x*(5/x²) = 30/x m²
The cost is $6 per m², therefore the cost of the sides is
(30/x)*($6) = 180/x

The total cost is
C = 20x² + 180/x

The minimum cost is determined by C' = 0.
That is,
40x - 180/x² = 0
x³ = 180/40 = 4.5
x = 1.651
The second derivative of C is
C'' = 40 + 360/x³
C''(1.651) = 120 >0, so x = 1.651 m yields the minimum cost.

The total cost is
C = 20(1.651)² + 180/1.651 = $163.54

Answer: $163.54

7 0
3 years ago
Help please !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
nikklg [1K]

Answer:

idk


Step-by-step explanation:


4 0
3 years ago
This time you are going to enter you answer differently. Recall the factors of 12 are 1, 2, 3, 4, 6, 12. You will enter this as
mafiozo [28]

Answer:

2,3,6

Step-by-step explanation:

those are the only positive factors in there

5 0
2 years ago
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