3. Suppose the value of a rare quarter is increasing exponentially. In 2009 it was worth $0.80 and in 2010 it was worth $0.84. How much will it be worth in 2029? Step 1 Define the variables. Let x = the number of years since 2009. Let y = the value of the rare quarter. Step 2 Determine r. Step 3 Use r to determine b. У2 — У1 b = 1 + r =1 + 0.05 = 1.05 У1 0.84 0.80 = 0.05 0.80 Step 4 Write the model. Step 5 Use the model to find the value of ab* the quarter in 2029. y 0.84 a(1.05)° For the year 2029, 0.84 = a x = 2029 2009 20. The model is y 0.84(1.05)*. y = 0.84(1.05)* 0.84(1.05)20 = 2.23 The quarter will be worth about $2.23 in 2029.
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
For each exercise, identify the error(s) in planning the solution or solving the problem. Th en write the correct solution
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