Answer:
B. 55°
Step-by-step explanation:
Note that the total angle measurements of a triangle is = 180°.
Add all the measurements together:
40 + y + 30 + y = 180
Simplify. Combine like terms:
(40 + 30) + (y + y) = 180
70 + 2y = 180
Isolate the y. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First subtract, then divide.
Subtract 70 from both sides:
70 (-70) + 2y = 180 (-70)
2y = 180 - 70
2y = 110
Divide 2 from both sides:
(2y)/2 = (110)/2
y = 110/2
y = 55
B. 55° is your answer.
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Answer:
She rounded down instead of up.
Step-by-step explanation:
When you are rounding, if the number is above 5 you round up and when the number is below 5 you round down.
Answer:
Step-by-step explanation:
Let m be the cost of meal in dollars.
We have been given that the tax on meal at the restaurant is 5% of meal, so the cost of meal after tax will be m plus 5% of m. We can represent this information in an equation as:
We are told that Alice decides to leave a tip of 20% of the cost of the meal plus the tax. This means that tip will be 20% of cost of meal after tax.
The total cost of meal will be equal to the cost of meal after tax plus amount paid by Alice as the tip.
Therefore, the expression represents the total amount of Alice's bill in dollars.