Volume of a rectangular prisms is 150 cm it's base has length that 5cm long and width 6cmwhat is the height

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Ответ:

itsmsjojobabyy5716

24.10.2022

Mathematics

64 or more

Step-by-step explanation:

First, find the average of three tests scores:

$\dfrac{69+88+73}{3}=\dfrac{230}{3}\approx 77$

Now

77 points - 40%

63 points - 20%

69 points - 20%

x points - 20%

Overall score must be 70 or better, so

$0.4\cdot 77+0.2\cdot 63+0.2\cdot 69+0.2\cdot x\ge 70\\ \\30.8+12.6+13.8+0.2x\ge 70\\ \\57.2+0.2x\ge 70\\ \\0.2x\ge 70-57.2\\ \\0.2x\ge 12.8\\ \\2x\ge 128\\ \\x\ge 64$

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