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nadezda [96]
3 years ago
15

the ratio of boys to girls at a local sports club is 3 to 1. If there are 45 girls, how many boys are there?

Mathematics
2 answers:
viva [34]3 years ago
6 0

Answer:

Step-by-step explanation: for you to get the answer you have to understand that 3 to 1 means to multiply by 3 so 45x3=135

Gnoma [55]3 years ago
5 0

Answer:

135

Step-by-step explanation:

1x = 45

3x (boys) = 45 ×3

= 135

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Mariana [72]

Answer:

option B

Step-by-step explanation:

Given :

y = \frac{2}{3}x + 3\\\\y = \frac{5}{2}x + \frac{7}{2}\\\\

Step 1 : simplify the equation :

3y = 2x + 9\\\\2y = 5x + 7\\

Step 2: Arrange the terms :

2x - 3y = - 9\\\\5x -2 y = -7

Step 3 : Solve for x and y :

                                2x - 3y = - 9 ------ ( 1 )

                                5x - 2y = - 7 --------- ( 2 )

                              _____________________

              ( 1 ) x 5 => 10x - 15y = - 45    ---------- (3 )

              ( 2) x 2 => 10x - 4y = - 14    ----------- (4 )

                             _______________________              

           ( 3 ) - ( 4 ) =>  0x - 11y = - 31

                                    - 11 y = - 31

                                        y = \frac{31}{11}

              Substitute y in ( 1 ) :

                     2x - 3y = - 9

                     2x - 3 (\frac{31}{11}) = - 9\\\\2x = -9 + 3(\frac{31}{11})\\\\2x = - 9 + \frac{93}{11}\\\\2x = \frac{-99 + 93}{11} \\\\2x = \frac{-6}{11} \\\\x = \frac{-6}{2 \times 11} = -\frac{3}{11}

Therefore the solution to the sytem is ( - \frac{3}{11} , \frac{31}{11})

The solution of the system of equation is a point which lies

on the both the lines.

Option A : False ,  It says the solution lies above one of the given line.

               But the solution of the system of equation always lies on

                both the line.

                     

Option B : True , says the solution is a point on the coordinate plane.

Option C : False, because if the solution is on the x-axis , then

                  the y coordinate in the solution would be zero.

                   But it  is not zero.

Option D : False , the solution is the point where both the lines intersect.

8 0
3 years ago
Eliza got a box of chocolates for Valentine's
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Step-by-step explanation:

5 0
3 years ago
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Answer:

because 2 and 3 are all prime factors

Step-by-step explanation:

6 0
3 years ago
What is the geometric mean of the pair of numbers? 245 and 5
VLD [36.1K]

Answer:

35

Step-by-step explanation:

The geometric mean of n numbers is the n-th root of their product.

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7 0
3 years ago
The equation for line j can be written as
yawa3891 [41]

Answer:

y + 8 = x + 10

Step-by-step explanation:

the equation of a line in point- slope form is

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where m is the slope and (a, b) a point on the line

y - 6 = -(x + 7) is in this form with slope m = - 1

given the slope of a line m then the slope of a line perpendicular to it is

m_{perpendicular} = - \frac{1}{m} = - \frac{1}{-1} = 1

using m = 1 and (a, b) = (- 10, - 8), then

y + 8 = x + 10 ← equation of line k

or y = x + 2 ← in slope- intercept form



3 0
3 years ago
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