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Lecture
3 Videos

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Section Intro

*ex* Two squares whose side lengths are consecutive odd integers have a total area of `650 cm^2`

. What is their total perimeter?

Therefore, the total perimeter is `144 cm`

.

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4.04mins

Finding Area Dimension from Given Conditions

*ex* In laying out a park, the landscape artist includes a rectangular flowerbed 18 m by 12 m. Within the bed, she plans to have a uniform-width border of annuals around a permanent rose bed. To obtain the best appearance, she wants the rose bed to be exactly half the total area. What is the width of the border, correct to one decimal place?

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6.07mins

Finding Dimension of a Park

Solutions
30 Videos

Create a quadratic model for the height of a toy rocket launched upward at `45`

m/s from a `2`

-m platform.

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0.37mins

Q1a

How long would the rocket take to fall to Earth, rounded to the nearest hundredth of a second?

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1.01mins

Q1b

A firework is launched upward at an initial velocity of `49`

m/s, from a height of `1.5`

m above the ground. The height of the firework, in metres, after `t`

seconds, is modelled by the equation `h=-4.9t^2+49t+1.5`

a) What is the maximum height of the firework above the ground?

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1.54mins

Q2a

A firework is launched upward at an initial velocity of 49 m/s, from a height of 1.5 m above the ground. The height of the firework, in metres, after `t`

seconds, is modelled by the equation `h=-4.9t^2+49t+1.5`

Over what time interval is the height of the firework greater than `100`

m above the ground? Round to the nearest hundredth of a second.

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3.10mins

Q2b

The length of a rectangle is `16`

m greater than its width. The area is `35`

`m^2`

. Find the dimensions of the rectangle, to the nearest hundredth of a metre.

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1.46mins

Q3

The product of two consecutive numbers is `3306`

. What are the numbers?

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2.43mins

Q4

Determine two consecutive odd integers whose product is `323`

.

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1.16mins

Q5

The length of one leg of a right triangle is `7`

cm more than that of the other leg. The length of the hypotenuse is `3`

cm more than double that of the shorter leg. Find the lengths of each of the three sides.

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2.08mins

Q6

A cylindrical can with height `12`

cm has capacity `600`

mL. What is its radius. to the nearest millimetre? [Remember that `1 mL = 1 cm^3`

.]

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1.52mins

Q8

The area of a triangle is `20`

cm`^2`

, and the altitude is 4 cm greater than the base. Find the length of the base. to the nearest millimetre.

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2.09mins

Q9

The sum of the squares of two consecutive integers is `365`

. Find the integers.

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1.52mins

Q10

A rectangle has perimeter `23`

`cm`

. Its area is `33`

`cm^2`

. Determine the dimensions of the rectangle. Include a diagram in your solution.

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3.06mins

Q11

A rectangular construction site is enclosed on three sides using `1200`

m of fencing. The remaining side is formed by an existing wall. What dimensions enclose `180 000`

m`^2`

of land?

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2.14mins

Q12

The three sides of a right triangle are consecutive even integers. What is the length of each side?

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1.24mins

Q13

A ladder is `6`

m long. If the height of the top of the ladder must be no greater than `10`

times the distance from the base to the wall, how high up a wall can the top of the ladder be placed? Include a diagram in your solution. Round to the nearest millimetre.

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1.48mins

Q14

A science experiment involves launching a small rocket. The following measurements are taken:

Initial height: `0.61`

m

Initial vertical velocity: `36.85`

m/s

**a)** Create a quadratic model for the height, in metres, of the rocket after a given number of seconds.

**b)** Verify the following results of the experiment:

Total time in the air: `7.54`

s

Maximum height: `69.89`

m

**c)** Sketch a graph of this relation and label the key information as in Example 1 of this section.

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4.22mins

Q15

The acceleration due to gravity on Earth is `9.8`

m/s`^2`

. A ball is thrown upward at an initial velocity of 15 m/s from a height of `1`

m above the ground. Round answers to the nearest tenth.

a) Write an equation for the height of the ball.

b) What is the height of the ball after 1 s?

c) After how many seconds does the ball land?

d) What is the maximum height of the ball? When does this occur?

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2.53mins

Q16

Shelly sells photos of athletes to baseball, basketball, and hockey fans after their games. Her regular price is $10 per photograph, and she usually sells about 30 photographs. Shelly finds that, for each reduction in price of $0.50, she can sell an additional two photographs.

a) Total sales revenue is the product of the number of units sold and the price. Make an algebraic model to represent Sherri’s total sales revenue.

b) At what price will Sherri’s revenue be $150?

c) At what price will her maximum revenue occur?

d) At what price will her revenue be $0?

e) Graph the relationship between revenue and the number of price reductions. Which features on the graph represent the solutions to parts b), c), and d)?

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8.49mins

Q17

A rectangular picture frame measures `20`

cm by `30`

cm. A new frame is to be made by increasing each side length by the same amount.

The resulting enclosed area is to be 1064 `cm^2`

. Find the dimensions of the new picture frame. Include a diagram in your solution.

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2.42mins

Q18

A rectangular garden measures `15`

m by `24`

m. A larger garden is to be made by increasing each side length by the same amount. The resulting area is to be `1.5`

times the original area. Find the dimensions of the new garden, to the nearest tenth of a metre. Include a diagram in your solution.

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3.36mins

Q19

The length of a rectangular field is `2`

m greater than three times its width. The area of the field is 1496 `m^2`

. What are the dimensions of the field?

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2.57mins

Q20

An open-topped box is to be made from a rectangular piece of tin measuring `50`

cm by `40`

cm by cutting squares of equal size from each corner. The base area is to be 875 `cm^2`

**a)** Draw a diagram representing the information.

**b)** What is the side length of the squares being removed?

**c)** What is the volume of the box?

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4.26mins

Q21

A photograph measures `21`

cm by `15`

cm. A strip of constant width is to be cut from each side of the photo. so the area is reduced to 216 `cm^2`

. Find the width of the cut. Include a diagram in your solution.

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3.30mins

Q22

A photograph measures `20`

cm by `16`

cm. A strip of constant width is to be cut off the top and one side of the photo, so the area is reduced to `60\%`

of the area of the original photo. Find the width of the cut. Include a diagram in your solution.

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2.15mins

Q23

A rectangular field measures 15 m by 20 m. A rectangular area is to be fenced in by reducing each dimension by the same 1 amount. The fenced-in area will be `\displaystyle{\frac{1}{2}}`

the original area. What will the dimensions of the fenced-in area be? Include a diagram in your solution.

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1.44mins

Q24

A rotating liquid surface takes on the shape of a parabolic mirror. The diameter of the mirror is `6`

m. The vertex is `23`

cm below the edges. Find an equation to model the parabolic cross section of the mirror.

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1.56mins

Q25

Determine the number of points of intersection of each pair of parabolas. Justify your answer.

`\displaystyle y = x^2 + 2x + 7`

`\displaystyle y = x^2 -4x -1`

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1.27mins

Q27a

Determine the number of points of intersection of each pair of parabolas. Justify your answer.

`\displaystyle y = 3x^2 - 12x + 16`

`\displaystyle y = -2x^2 -4x + 3`

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1.40mins

Q27b

Determine the number of points of intersection of each pair of parabolas. Justify your answer.

`\displaystyle y = x^2 - 6x + 10`

`\displaystyle y = 5x^2 -30x + 46`

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1.02mins

Q27c

In the TV show Junkyard Wars, a trebuchet was used to catapult a pumpkin from a height of `4`

m for a total horizontal distance of `24`

m. It reached a maximum height of `14`

m. At what horizontal distances was the height of the pumpkin `10`

m, to the nearest metre?

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7.55mins

Q30