Joan had $3,000 to invest. She invested part of it in an investment paying 8% and the remainder in an investment paying 10%. If the total income on these investments was $290, then how much did she invest at the lower rate?
Equations and Inequations
Equations and inequalities describe the relationship between two mathematical expressions.
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A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.
Joan had $3,000 to invest. She invested part of it in an investment paying 8% and the remainder in an investment paying 10%. If the total income on these investments was $290, then how much did she invest at the lower rate?
Two thousand (2000) kg of steel containing 8% nickel is to be made by mixing a steel containing 14% with another steel containing 6% nickel. How much of the steel containing 14% nickel is needed?
What mathematical equation would represent the problem?
Let x be the amount of steel needed.
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