Dennis wants to buy a card for his wife. Dennis calculates the amount of the card as $ 4.50. The actual price of the card is $4. What is Dennis's % error?
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Okay, so this equation is a percent error, and how you solve those is doing:
First Subtract Approximate value from Exact value: 4.50 - 4 = 0.5 , so the error is 0.5
Now, show the error as a percent of the exact value ... so divide by the exact value and make it a percentage:
0.5/4 = 0.125 = 12.5%
Therefore the percent error would be: 12.5%
Show me 475 in expanded form
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400+70+5 because 400 is in the hundreds place and 70 in the tens place while 5 is in the ones place.
How does using an inverse operation help you solve an equation? *Please help*
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An inverse set of operations is a pair of operations that do the opposite of each other, such as multiplication and division. When solving an algebraic equation, you can use inverse functions to isolate the variable you are trying to find. For example: 5x=25 The expression 5x was arrived at by multiplying 5 times x. To reverse that multiplication, you would divide 5x by 5 and get x. However, since this is an equation, you would need to divide both sides of the equation by 5, or else it wouldn't still be equal. The result of dividing both sides is x=5. As you can see, by taking the inverse operation, you were able to isolate your variable (x) on one side of the equation and therefore solve for its value.
it helps you check the equation to see if you did it right hopefully i helped :}
a pay phon3 at a shopping mall charges $0.68 for the first four minutes and $0.21 for each additional find the cost of a 10-minute call on this phone.
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0.68 + (0.21x9)=2.57
.68x4 =2.72. .21x6=. 1.26. 1 .26 plus 2.72 = $3.98
8/15 multiplied by 5/6
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To multiply two fractions, we multiply the top number (numerators) together and the bottom numbers together (denominators) and then simplify.