19. An investor plans to invest $40,000 in a T-bill, in a mutual fund, and in corporate bonds. She plans to put as much in the bonds as the amount she puts in the T-bill plus the mutual fund together. She expects the T-bill to pay a 4% interest, the mutual fund 5% interest, and the bonds 6% interest. She would like her interest income to be $3,200. How much should she put in each of the three investments? Write a system of equations and solve using matrices. Let x = amount in the T – bill Let y = amount in the mutual fund Let z = amount in bonds | A B= X=
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.
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