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3 years ago

For which equation would x=5 be a solution?

Mathematics

1 answer:

kari74 [83]3 years ago

8 0

03x+6=21

3(5) = 15

15+6=21

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Convert this decimal into its fractional form, simplified completely. 0.625

IgorC [24]

Hello There!

Answer Attached In Image Below.

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3 years ago

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the slope of the line below is -3. use the coordinates of the labeled point to find a slope-point equation of the line. (5,-7)

HACTEHA [7]

$\bf (\stackrel{x_1}{5}~,~\stackrel{y_1}{-7})~\hspace{10em} slope = m\implies -3 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-(-7)=-3(x-5) \\\\\\ y+7=-3x+15\implies y=-3x+8$

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3 years ago

H=255-21t-16t^2 PLEASE HELP!!

Colt1911 [192]

Answer:

3.15 seconds is the answer.

Explanation

when the ball touches the ground, h =0

hence,

0=255-21t-16t²

16t²+21t-225=0

here a=16 ,b=21, c= -225

$t= \frac{ - b± \sqrt{ {b }^{2} - 4ac} }{2a} \\ \\ t= \frac{ - 21± \sqrt{ {21}^{2} - 4 \times 16 \times - 225} }{2 \times 16} \\ = \frac{ - 21 ± \sqrt{441 - ( - 14400)} }{32} \\ = \frac{ - 21± \sqrt{14841} }{32} \\ = \frac{ - 21±121.82}{32} \\ \\ t = \frac{ - 21 + 121.82}{32} \: or \: \: t = \frac{ - 21 - 121.82}{32} \\ t = 3.15 \: \: or \: \: t = - 4.46$

time cannot be negative, hence t = -4.46 can be avoided

The ball takes 3.15 seconds to hit the ground.

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3 years ago

Suppose two rectangles are similar with a scale factor of 2. What is the ratio of their areas?

zubka84 [21]

Similar means their sides have the same ratio but don't have to be the same length. So if two rectangles are similar with a scale factor of 2 then the ratio of their areas would be 4:1.

Hope this helped :)

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4 years ago

Simplify for this question !

PolarNik [594]

Answer:

=6x^9-3 [12/2=6]

=6x^6

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