The student's error was in first step where he added -0.72 instead of 0.72
Step-by-step explanation:
Given equation;
z + (-0.72) = -2.5
When solving for z, eliminate the other numbers from one side.
Step 1: z + (−0.72) + (−0.72) = −2.5 + (−0.72)
In this step, the student should have added 0.72 because -0.72 was already present in the equation and to eliminate it, he should have add same number with opposite sign.
According to this Step, -0.72 and -0.72 would have been added, because according to mathematics, two numbers with minus sign are added and the sign remains same.
The student's error was in first step where he added -0.72 instead of 0.72
Keywords: addition, subtraction
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Answer:
y = -1/2x - 4
Step-by-step explanation:
The total expenses of Marco's account are $174. The ending balance is $81. So, the starting balance will be $255.
Option A is correct for starting balance.
Further Explanation on Starting and Ending Balance
Given that Marco’s bank statement says that he has an ending balance of $81. The expenses $ of Marco is given as,
- T-shirt 20
- Gas 22
- Movie 13
- Video game 39
- Jeans 34
- Hat 15
- Books 31
The total expenses can be calculated as given below.
Total Expenses = Sum of all Expenses
Total Expenses = 20+22+13+39+34+15+31
Total Expenses = $174
The starting balance can be calculated as given below.
Starting Balance = 
Starting Balance = $ 255.
Hence we can conclude that the starting balance of Marco's account is $255. Option A is correct.
To know more about expenses, follow the link given below.
brainly.com/question/24803457.
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