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3 years ago

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Mathematics

2 answers:

hoa [83]3 years ago

7 0

Answer:

im my opionion i would say 7.875 or 7.9 hours with thme working together combined thats my estimate dont hate me if its wrong ;|

Step-by-step explanation:

snow_tiger [21]3 years ago

5 0

If Bob can do it alone in 14 hours then he can do 1/14 of the job each hour

James can do 1/18 of the job each hour.

let x = time it takes them working together

then

x/14 + x/18 = 1 (this statement says that the number of hours x times Bob's rate and James's rate added will give 1 or the full job

18x + 14x = 252

32x = 252

x = 7.875 hours (time to finish when working together

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Points B, O, Y are collinear on BY, and BO:OY=5/8. B is located at (4,2), O is located at (7, -3) and Y is located at (x,y). Det

Viktor [21]

Answer:

x = $\frac{59}{5}$

y = -11

Explanation:

Given that a line segment BY. O is the point lies between B & Y.

Ratio is BO:OY = 5:8

Coordinate of point B = (4,2)

Coordinate of point O = (7,-3)

We will find the coordinate of Y (x,y)

Here we use the section formula.

Internal section formula is :

$Y(x,y) =(\frac{mx_{2}+nx_{1}}{m + n},\frac{my_{2}+ny_{1}}{m + n})$

(7,-3) = $(\frac{5*x+8*4}{5+8} ,\frac{5*y+8*2}{5+8} )$

(7,-3) = $(\frac{5x+32}{13}, \frac{5y+16}{13})$

Now

7 = $\frac{5x+32}{13}$

5x+32 = 91

x = $\frac{59}{5}$

and

$-3 =\frac{5y+16}{13}$

5y + 16 = -39

y = -11

That's the final answer.

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3 years ago

What is the value of the expression (-7)(3)-(5)-3)?

balandron [24]

Answer:

Step-by-step explanation: -81

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Suppose ∠A and ∠B are complementary angles, m∠A = (3x + 5)°, and

mario62 [17]

m∠A + m∠B = 90
(3x + 5) + (2x - 15) = 90
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5 5
x = 20

m∠A = 3x + 5
m∠A = 3(20) + 5
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m∠B = 2(20) - 15
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3 years ago

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Ivanshal [37]

Given:

Product of two numbers is 24

Sum of two numbers is -11

-8 and -3 are the two numbers.

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1 year ago

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AleksandrR [38]

Answer:

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Step-by-step explanation:

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