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3 years ago

6

Please help me on this thank you so much all

2 answers:

Lynna [10]3 years ago

8 0

Over 50 volunteers has helped over 15 hours

icang [17]3 years ago

5 0

60 volunteers worked more than 15 hours

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There are 10 kids in class. 7 boys and 3 girls. If the teacher were to pick 4 students at random what is the probability of sele

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Well there are 7 boys and 10 students total so 7/10=0.7=70%. Therefore there is a 70% chance.

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What percent of 202 is 34

julia-pushkina [17]

Answer:

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68.68 is 202% of 34.

Step-by-step explanation:

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202% × 34 = 68.68

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3 years ago

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Please help! Correct answer only, please! Consider the matrix shown below: Find the determinant of the matrix Q. A. -67 B. -65 C

Nonamiya [84]

Answer: d) 67

<u>Step-by-step explanation:</u>

$determinant\ \left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&j\end{array}\right] = a\cdot det\left[\begin{array}{cc}e&f\\h&j\end{array}\right] -\ b\cdot det\left[\begin{array}{cc}d&f\\g&j\end{array}\right] +\ c\cdot det\left[\begin{array}{cc}d&e\\g&h\end{array}\right]$

$determinant\ \left[\begin{array}{ccc}2&3&4\\-3&2&1\\5&-1&6\end{array}\right] \\\\\\= 2\cdot det\left[\begin{array}{cc}2&1\\-1&6\end{array}\right] -\ 3\cdot det\left[\begin{array}{cc}-3&1\\5&6\end{array}\right] +\ 4\cdot det\left[\begin{array}{cc}-3&2\\5&-1\end{array}\right]\\\\\\=2[2(6)-1(-1)]-3[-3(6)-1(5)]+4[3(-1)-2(5)]\\\\\\=2(13)-3(-23)+4(-7)\\\\\\=26+69-28\\\\\\=\large\boxed{67}$

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4 years ago