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2 years ago

At dan's school,6 out of every 10 kids know how to swim. If there are 350 kids in his school,how many know how to swim?

2 answers:

5 0

If the ratio of kids who know how to swim is 6:10, that means that 60% of the schools population knows how to swim. So you can multiply 350 by 0.60 to get 210 kids.

You can show why the calculation is true since 6/10 = x/350. We can say the two ratios are equal since 6/10 ratio holds true for every group of 10 that leading up to a total number of 350. (you can have 35 groups of 10 each one having a 6 to 10 ratio. (6/10)x(35/35)=210/350

Bogdan [553]2 years ago

4 0

210 because if you multiply 10 by 35 to get 350 you have to multiply 6 by 35 then you get 210

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Find the value of x 25 points!

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2 years ago

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$(9x + 17) +2 \times ( 5x + 15 ) + (6x - 12) = 360 \\$

$9x + 17 + 10x + 30 + 6x - 12 = 360 \\$

$9x + 10x + 6x + 17 + 30 - 12 = 360 \\$

Collect like terms

$25x + 35 = 360$

Subtract sides 35

$25x + 35 - 35 = 360 - 35$

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Divide sides by 25

$\frac{25x}{25} = \frac{325}{25} \\$

$x = 13$

Thus ;

$RQ \: \: arc =2 \times (5x + 15)$

$RQ \: \: arc = 10x + 30$

$RQ \: \: arc = 10(13) + 30$

$RQ \: \: arc = 130 + 30$

$RQ \: \: arc = 160°$

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2 years ago

1. If two nonvertical lines are parallel, what do we know about their slopes? If two lines are perpendicular and neither is para

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Answer:

Two straight lines with slopes m and m' are parallel when m = m'

Two straight lines with slopes m and m' are perpendicular when m × m' = - 1.

Step-by-step explanation:

Let us assume that the two non-vertical lines in the slope-intercept form are

y = mx + c ........... (1) and

y = m'x + c' ............ (2)

If those two lines are parallel then we can say the slope of them will be the same i.e. m = m'

Now, if given two straight lines (1) and (2) are perpendicular to each other and neither of them is parallel to the axes, then we can write m × m' = - 1. (Answer)

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3 years ago

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Dmitry_Shevchenko [17]

Answer:

-3g-4

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2 years ago

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we know, that both commissions added together, are $415

thus

0.035x + 0.05x = 415 <----- solve for "x"

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3 years ago