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3 years ago

It takes 4 3/4 hours to print some letters when 7 printers are used.

Mathematics

1 answer:

romanna [79]3 years ago

6 0

Answer: This is what I could figure out

Step-by-step explanation:

You might be interested in

What is the greatest common factor of 42,84,and 105 and how do you find it

klemol [59]

The GCF Of All Those Numbers Would Be 7.
6(7)= 42
12(7)= 84
15(7)= 105

7 0

3 years ago

if i have 80 people and there are 4 phones how long would it take for 80 people to.complete one phone call

svp [43]

Depends how long each call is.
80 people divided by 4 phones is 20 rotataions on the phone.
If each call is 2 minutes that’s 20x2 = 40 minutes.

6 0

3 years ago

totsakans bike shop rents bikes for $15 plus $7 per hour. Ming paid $50 to rent a bike. for how many hours did she rent the bike

USPshnik [31]

Answer:

5 hours

Step-by-step explanation:

Set up an equation where y=total cost and x= hours

y=7x+15

Substitute 50 for y, the total cost, and solve for x, the total hours

50=7x+15, Subtract 15 from both sides

35=7x, Divide both sides by 7 to get x alone

x=5

8 0

3 years ago

Calculate AD and hence BD.

Vilka [71]

Answer:

AD = 15 cm , BD = 3 cm

Step-by-step explanation:

Δ ABC is similar to Δ ADE ( by the AA postulate )

then the ratios of corresponding sides are in proportion, that is

$\frac{AD}{AB}$ = $\frac{DE}{BC}$ ( substitute values )

$\frac{AD}{12}$ = $\frac{10}{8}$ ( cross- multiply )

8 × AD = 12 × 10 = 120 ( divide both sides by 8 )

AD = 15 cm

AB + BD = AD , that is

12 + BD = 15 ( subtract 12 from both sides )

BD = 3 cm

7 0

2 years ago

Let a=<-4,-3,5> Find a unit vector in the same direction as having positive first coordinate.

Rashid [163]

Answer:

The value is $u = < \frac{2\sqrt{2}}{10} , \frac{3\sqrt{2}}{10} , - \frac{\sqrt{2}}{2}>$

Step-by-step explanation:

From the question we are told that

The vector is a=<-4,-3,5>

Generally the unit vector is $u = ay$

Here y represent the y-coordinate

$u =y$

=> $u =$

Generally the resultant of a unit vector is 1

$|u| = \sqrt{ (-4y)^2 + (-3y)^2 + (5y)^2} = 1$

Hence

$|u| = \sqrt{ 16y^2 + 9y^2 + 25y^2} = 1$

Taking the square of both sides

$16y^2 + 9y^2 + 25y^2 = 1$

=> $50y^2 = 1$

=> $y = \pm \frac{1}{\sqrt{50}}$

=> $y = \pm \frac{1}{5 \sqrt{2}}$

Rationalizing

=> $y = \pm \frac{\sqrt{2}}{10}$

Given that the first coordinate is positive

$y = - \frac{\sqrt{2}}{10}$

Hence the unit vector is

$u =$

=> $u = < \frac{2\sqrt{2}}{10} , \frac{3\sqrt{2}}{10} , - \frac{\sqrt{2}}{2}>$

4 0

3 years ago