(Needs editing) Math 20-2 Final Exam Review

Six cobs of corn cost $2.05. The unit cost, rounded to cents, is $ _____ per cob.

Answer explanation

$6.60/cob

A butcher shop sells a 3-pound package of chicken legs for $9.57. The supermarket sells chicken legs for $7.68/kg. (2.2 pounds per kg)

A pair of equations that could be used to determine which store has the lower price according to unit rate is:

• A. $9.57 × 3 = $28.71/lb, $7.68 × 2.2 = $17.16/lb

• B. 3 lb / $9.57 = $3.19 / 1 lb, 2.2 lb / $7.68 = $7.08 / 1 lb

• C. $9.57 / 3 lb = $3.19 / 1 lb, $7.68 / 2.2 lb = $3.49 / 1 lb

• D. $9.57 / 3 lb = $6.38 / 2 lb, $7.68 / 2.2 lb = $14.16 / 2 lb

The interval of time when the average rate of change of temperature is 1°C per hour is

• midnight to 4 AM

• 4 AM to 5 AM

• 5 AM to 10 AM

• 11:30 AM

The interval of time when the average rate of change of temperature is the greatest is __i__ because the line segment __ii__. The statement above is completed by the information in row

• midnight to 4 AM, is increasing

• 4 AM to 5 AM, has a positive slope of 4/1

• 5 AM to 10 AM, reaches a height of 10

• 10 AM to noon, has the steepest slope

Oil Well A pumps out oil at a rate of 2.75 barrels per hour. The graph below represents the rate, in barrels per hour, that oil is pumped from Well B.

Compare the rates, in barrel per hour, that oil is pumped from Well A and Well B.

A company has an advertisement poster that they want to enlarge for a billboard. The width of the poster paper is 24 inches. The width of the large billboard is 28 feet. The scale factor used to enlarge the poster for the width of the poster to fit the width of the billboard is

• 1 : 14

• 14 : 1

• 24 : 28

• 6 : 7

The linear scale factor by which Triangle X was reduced to form Triangle Y can be written in the simplified form \(\frac{a}{b}\), where \(a, b \in \mathbb{N}\). The value of \(a\) is _____.

Determine, using proportional reasoning, the height of the actual apartment building, to the nearest metre. An architect has created a scale model of a new apartment building to be used in a presentation to the building developers. The height of the scale model is 40 cm. A scale of 1:60 was used for the model.

The base and height of a trapezoid with an area of 35 cm² will be enlarged by a scale factor of 4. An expression representing the area of the enlarged trapezoid could be

• (35)(4) cm²

• (35)(4²) cm²

• (35²)(4) cm²

• (35*4)² cm²