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GuDViN [60]
3 years ago
9

1. Jackson has 75¢ in dimes, d, and nickels, n, in his pocket. Which equation could be solved to find the possible combinations

of dimes and nickels Jackson has?
A. 75 = d + n B. 75 = dn C. 75 = 10d ·5n D. 75 = 10d + 5n

The linear equation below has two variables. PLEASE HELP ME!
y = (-1/4)x – 1

Which shows the solutions to the equation when x = 4, x = 0, and x = -4?

A. (-2, 4), (1, 0), (0, -4) C. (2, -4), (-1, 0), (0, 4)
B. (4, -2), (0, -1), (-4, 0) D. (-4, 2), (0, 1), (4, 0)

A 50-foot roll of fencing will be used to enclose a rectangular garden. Which equation below could not be solved to find the possible lengths, l, and widths, w, of the garden?

A. 50 = 2lw C. 2(l + w) = 50
B. 50/2 = l + w D. 50 = 2l + 2w


4. Ms. Monti bought x adult tickets and y children’s tickets to an ice-skating show. She spent a total of $145. The equation below describes the relationship between x and y.

25x + 15y = 145

The ordered pair (4, 3) is a solution of the equation. What does the solution (4, 3) represent?

A. Ms. Monti bought 4 adult tickets and 3 children’s tickets.
B. Adult tickets cost $4 each and children’s tickets cost $3 each.
C. Ms. Monti spent $4 on adult tickets and $3 on children’s tickets.
D. The cost of 4 adult tickets equals the cost of 3 children’s tickets.


The growth of a kitten is described by the equation y = 2.5x + 4, where y represents the kitten’s weight in ounces x weeks after it was born. What is the meaning of the fact that the point (4, 14) lies on the graph of the equation?

A. The kitten had an initial weight of 4 ounces.
B. The kitten is growing at a rate of 4 ounces per week.
C. The kitten weighed 4 ounces when it was 14 weeks old.
D. The kitten weighed 14 ounces when it was 4 weeks old.
Mathematics
1 answer:
SpyIntel [72]3 years ago
8 0

Answer:

Part 1) Option D 75=10d+5n

Part 2) Option B (4, -2), (0, -1), (-4, 0)

Part 3) Option A 50=2LW

Part 4) Option A Ms. Monti bought 4 adult tickets and 3 children’s tickets

Part 5) Option D The kitten weighed 14 ounces when it was 4 weeks old

Step-by-step explanation:

Part 1)

we know that

1\ dime=\$0.10

1\ nickel=\$0.05

Let

d-------> the number of dimes

n-----> the number of nickels

so

0.10d+0.05n=0.75

Multiply by 100 both sides

10d+5n=75

Part 2)

we have

y=(-\frac{1}{4})x-1

To calculate the solutions of the equation for an x value, substitute the value of x in the equation and find the value of y

For x=4 -----> y=(-\frac{1}{4})(4)-1=-2 ----> (4,-2)

For x=0 -----> y=(-\frac{1}{4})(0)-1=-1 ----> (0,-1)

For x=-4 -----> y=(-\frac{1}{-4})(4)-1=0 ----> (-4,0)

Part 3)

we know that

The perimeter of a rectangle is equal to

P=2(L+W)

we have

P=50\ ft

substitute

50=2(L+W) ------> 50/2=(L+W) -----> 50=2L+2W

Par 4)

Let

x------> the number of adult tickets

y------> the number of children tickets

we have

25x + 15y = 145

The ordered pair (4,3) represent

x=4\ adult\ tickets

y=3\ children\ tickets

therefore

Ms. Monti bought 4 adult tickets and 3 children’s tickets

Part 5)  

Let

x------> the number of weeks after it was born

y-----> the kitten’s weight in ounces

we have

y=2.5x+4  

The ordered pair (4,14) represent

x=4\ weeks

y=14\ ounces

therefore

The kitten weighed 14 ounces when it was 4 weeks old


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A. 1206 cm³

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We have a cone and are asked to find the approximate volume of it.

Keep in mind we are using π for 3.14

The forumla of a cone is V = πr²\frac{h}{3}

We know the radius = 12

and the height = 8

Substitute :

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Since these are multiplied with each other, we can first start off with multiplying the fraction, including with factoring 12²:

V = \frac{2^4*3^2*8\pi }{3}

Cancel the common factor - 3 :

V = 2^4 * 8 * 3\pi

Multiply 8 and 3π :

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3 0
3 years ago
Use Lagrange multipliers to find the dimensions of the box with volume 1728 cm3 that has minimal surface area. (Enter the dimens
Dima020 [189]

Answer:

(x,y,z) = (12,12,12) cm

Step-by-step explanation:

The box is assumed to be a closed box.

The surface area of a box of dimension x, y and z is given by

S = 2xy + 2xz + 2yz

We're to minimize this function subject to the constraint that

xyz = 1728

The constraint can be rewritten as

xyz - 1728 = 0

Using Lagrange multiplier, we then write the equation in Lagrange form

Lagrange function = Function - λ(constraint)

where λ = Lagrange factor, which can be a function of x, y and z

L(x,y,z) = 2xy + 2xz + 2yz - λ(xyz - 1728)

We then take the partial derivatives of the Lagrange function with respect to x, y, z and λ. Because these are turning points, each of the partial derivatives is equal to 0.

(∂L/∂x) = 2y + 2z - λyz = 0

λ = (2y + 2z)/yz = (2/z) + (2/y)

(∂L/∂y) = 2x + 2z - λxz = 0

λ = (2x + 2z)/xz = (2/z) + (2/x)

(∂L/∂z) = 2x + 2y - λxy = 0

λ = (2x + 2y)/xy = (2/y) + (2/x)

(∂L/∂λ) = xyz - 1728 = 0

We can then equate the values of λ from the first 3 partial derivatives and solve for the values of x, y and z

(2/z) + (2/y) = (2/z) + (2/x)

(2/y) = (2/x)

y = x

Also,

(2/z) + (2/x) = (2/y) + (2/x)

(2/z) = (2/y)

z = y

Hence, at the point where the box has minimal area,

x = y = z

Putting these into the constraint equation or the solution of the fourth partial derivative,

xyz - 1728 = 0

x³ = 1728

x = 12 cm

x = y = z = 12 cm.

7 0
2 years ago
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