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3 years ago

In a class of students, the following data table summarizes how many students play

Mathematics

1 answer:

Alex73 [517]3 years ago

6 0

Answer:

79.31%

Step-by-step explanation:

First we need to find the total number of students.

We do that summing all the four values in the table:

Total students = 2 + 18 + 3 + 6 = 29

Then, the students that play a sport or an instrument are all student but the ones that don't play both:

Students(sport or instrument) = 29 - 6 = 23

So the probability of a random student playing a sport or an instrument is 23/29 = 0.7931 = 79.31%

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Dad is 4 times as old as his son Jim. In 10 years, Dad's age will be 20 years more than twice Jim's age. How old is Jim?

goldenfox [79]

Answer: Jim is <span>15 years old

Jim = 15 years old,
</span><span>Dad is 4 times as old as his son Jim = = 15 x 4 = 60

In 10 years, Jim = 15 + 10 =25 years old
Dad = 60 + 10 = 70

</span><span>Dad's age will be 20 years more than twice Jim's age
</span><span>
Dad's age = 20 + 2(25) = 70

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prohojiy [21]

Answer:

$\huge\boxed{\sf Option \ B}$

Step-by-step explanation:

$\displaystyle x^2+\frac{bx}{a} =\frac{-c}{a}$ --------------------(1)

to find the b² for the expression on the left.

Take the expression

$\displaystyle x^2 + \frac{bx}{a}$

<u>We can also write it as:</u>

$\displaystyle (x)^2 + 2(x)(\frac{b}{2a} )$

According to the formula $a^2+2ab+b^2$ , the b of this expression is $\displaystyle \frac{b}{2a}$ . So,

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$\displaystyle =(\frac{b}{2a} )^2\\\\=\frac{b^2}{4a^2}$

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For STEP 4, the equation will become:

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$\rule[225]{225}{2}$

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2 years ago

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