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grigory [225]
3 years ago
7

Alexis was keeping track of how much money she was spending online shopping. On Monday she spent $50. Tuesday she spent $65. Wed

nesday she spent $72. Thursday she spent $45. Friday she spent $48. Saturday she spent $110. She can't remember what she spent on Sunday, but she knows that the average of her spending for the week was $70. How much did she spend Sunday?
Mathematics
1 answer:
kramer3 years ago
3 0

Answer:

Step-by-step explanation:

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AC = 5 cm

BD = 12.5 cm (3 sf) [or 2 × root 39]

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<u>A</u><u>C</u><u> </u><u>=</u><u> </u><u>5</u><u> </u><u>c</u><u>m</u>

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= 2(6.2450)

<u>B</u><u>D</u><u> </u><u>=</u><u> </u><u>1</u><u>2</u><u>.</u><u>5</u><u> </u><u>c</u><u>m</u><u> </u><u>(</u><u>3</u><u> </u><u>s</u><u>f</u><u>)</u><u> </u><u>[</u><u>o</u><u>r</u><u> </u><u>2</u><u> </u><u>×</u><u> </u><u>r</u><u>o</u><u>o</u><u>t</u><u> </u><u>3</u><u>9</u><u>]</u>

(BA)^2 + (AE)^2 = (BE)^2 [Pythagoras theorem]

39 + 9 = (BE)^2

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