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Sauron [17]
3 years ago
13

The baking sheet shown holds 12 cookies. Each cookie has a diameter of 3 inches.

Mathematics
1 answer:
lina2011 [118]3 years ago
6 0

Answer:

23 in^2

Step-by-step explanation:

We need to find the area of the baking sheet and the area of the 12 cookies. Then we subtract the area of the cookies from the area of the baking sheet.

Baking sheet:

length = 4 cookies = 4 * 3 in. = 12 in.

width = 3 cookies = 3 * 3 in. = 9 in.

area = length * width = 12 in. * 9 in. = 108 in.^2

Cookies:

diameter = 3 in.

radius = diameter/2 = 3 in./2 = 1.5 in.

area of 1 cookie = (pi)r^2

area of 12 cookies = 12(pi)r^2 = 12(3.14159)(1.5 cm)^2 = 84.823 in.^2

area of unused space =

= area of baking sheet  area of 12 cookies

= 108 in.^2 - 84.823 in.^2

= 23.177 in.^2

Answer: 23 in^2

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A ball thrown in the air has a height of y = - 16x² + 50x + 3 feet after x seconds. a) What are the units of measurement for the
Lubov Fominskaja [6]
<h2>Answer:</h2>

(a) ft/s

(b) 1ft/s

<h2>Step-by-step explanation:</h2>

Given equation;

y = (- 16x² + 50x + 3)ft       -------------(i)

Where;

y is measured in feet(ft)

x is measured in seconds(s).

(a) The rate of change of y with respect to x is found by dividing the total change in y by the total change in x. i.e

Δy / Δx

Where;

Δy = y₂ - y₁  

Δx = x₂ - x₁

∴ Δy / Δx = \frac{y_2 - y_1}{x_2 - x_1}              --------------(ii)

Since y is measured in feet, Δy will also be measured in feet.

Also, since x is measured in seconds, Δx will also be measured in seconds.

Therefore, the rate of change of y with respect to x (Δy / Δx) will be measured in feet per second (ft/s)

(b) The rate of change of y between x  = 0 and x = 2 can be found by using equation (ii)

Where;

y₂ is the value of y at x = 2 found by substituting x = 2 into equation (i)

y₁ is the value of y at x = 0 found by substituting x = 0 into equation (i)

=> y₂ =  - 16(2)² + 50(2) + 3 = 39

=> y₁ =  - 16(1)² + 50(1) + 3 = 37

Now, substitute the values of y₂, y₁, x₂ and x₁  into equation (ii)

Δy / Δx = \frac{39 - 37}{2 - 0}  

Δy / Δx = \frac{2}{2}

Δy / Δx = 1

Therefore, the rate of change of y is 1 ft/s

 

3 0
3 years ago
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