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3 years ago

1.) (-6) (-7) =

Mathematics

2 answers:

Jobisdone [24]3 years ago

5 0

$\left(-6\right)\left(-7\right)=42$

$46=2\quad :\quad \mathrm{False}$

$\left(-9\right)+25=16$

$\left(13\right)\left(-3\right)=-39$

$14+3=17$

nata0808 [166]3 years ago

4 0

Answer:

1) 36

2) False

3) 16

4) -39

5) 17

Step-by-step explanation:

When multiply two negatives, the final answer is positive.

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An item cost $390 before tax, the sales tax is $31.20. Find the sales tax.

ch4aika [34]

Lol, channel be asking for a 100 dollars for a f-ing straw

4 0

3 years ago

Coach went and bought 4 bats and 7 baseballs for $68 the next day bought one bat and one ball for 14 how much is each individual

Crazy boy [7]

Answer:

Baseballs is: $10

Bats is: $4

Step-by-step explanation:

Let x represent bats

and y represent baseballs

So we have :

(1) 4x + 7y = 68

(2) x + y = 14 => y = 14 - x

Use substitution.

Substitute equation (2) into equation (1)

4x + 7(14 - x) = 68

Solve for x

4x + 98 -7x = 68

-3x + 98 = 68

-3x = -30

x = 10

Solve for y, replace x = 2 into equation (2)

y = 14 - 10 = 4, so y = 4

Since x represents bats and y represents baseballs, it cost $10 for the bats and $4 for the baseballs.

3 0

3 years ago

A closed cylindrical vessel contains a fluid at a 5MPa pressure. The cylinder, which has an outside diameter of 2500mm and a wal

Julli [10]

Answer:

1) Increase in the diameter equals 3.5 mm

2) Increase in the length equals $0.0003724L_{i}$ where $L_{i}$ is the initial length of the vessel.

Step-by-step explanation:

The diametric strain in the vessel is given by

$\epsilon_{D} =\epsilon_{diam}-\nu \epsilon _{axial}$

We have

$\epsilon _{diam}=\frac{\sigma _{hoop}}{E}\\\\\sigma _{hoop}=\frac{\Delta P\times D}{2t}\\\\\therefore \epsilon _{diam}=\frac{\Delta P\times D}{2t\times E}$

Applying values we get

$\therefore \epsilon _{diam}=\frac{5\times 10^{6}\times 2.5}{2\times 20\times 10^{-3}\times 193\times 10^{9}}\\\\\therefore \epsilon _{diam}=\frac{5}{3088}$

Similarly axial strain is given by

$\epsilon _{diam}=\frac{\sigma _{axial}}{E}$

$\sigma _{axial}=\frac{\Delta P\times D}{4t}\\\\\therefore \epsilon _{axial}=\frac{\Delta P\times D}{4t\times E}$

Applying values we get

$\therefore \epsilon _{axial}=\frac{5\times 10^{6}\times 2.5}{4\times 20\times 10^{-3}\times 193\times 10^{9}}\\\\\therefore \epsilon _{diam}=\frac{2.5}{3088}$

Hence The effect of axial strain along the diameter is given by

$-\nu \epsilon _{axial}$

Applying values we get

$-\nu \epsilon _{axial}=-0.27\times \frac{2.5}{3088}=-0.0002185$

hence

$\epsilon _{D} =\frac{5}{3088}-0.0002185\\\\\epsilon =0.00140$

Now by definition of strain we have

$\epsilon _{D} =\frac{D_{f}-D_{i}}{D_{i}}\\\\\therefore D_{f}=D_{i}+\epsilon D_{i}\\\\D_{f}=2.5+0.0014\times 2.5\\\\\therefore D_{f}=2503.5mm$

Increase in the diameter is thus 3.5 mm

Using the same procedure for axial strain we have

$\epsilon_{axial} =\epsilon_{axial}-\nu \epsilon _{diam}$

Applying values we get

$\epsilon_{axial} =\frac{2.5}{3088}-0.27\times \frac{5}{3088}$

$\epsilon_{axial} =0.0003724$

Now by definition of strain we have

$\epsilon _{axial} =\frac{L_{f}-L_{i}}{L_{i}}\\\\\therefore \Delta L=0.0003724L_{i}$

where $L_{i}$ is the initial length of the cylinder.

6 0

4 years ago

As a result of a transfer from one school to another, a boy has to walk one

Softa [21]

Answer:

Let the distance of school and house is x k m

Then time taken at speed 2.5 km\hr=

2.5

And time taken at speed 4 km\hr=

∴

2.5

−

⇒

4x−2.5x

⇒x=3 km

Then the distance of school and house is 3 k m

may this help you

6 0

3 years ago

What is the LCM of 5 and 6?

Lapatulllka [165]

Answer: 30

Explanation: To find the least common multiple of lcm of 5 and 6, we begin by listing the first few multiples of each number.

Multiples of 5

1 x 5 = 5

2 x 5 = 10

3 x 5 = 15

4 x 5 = 20

5 x 5 = 25

6 x 5 = 30

Notice that we skipped 0 x 6 in our list of multiples. That's because 0 x 6 is 0 and our least common multiple can't be 0.

Next we list the multiples of 6. When we list the multiples of 6, it's a good idea to keep an eye on the list of multiples for 6 so that we know when we have found a least common multiple.

Multiples of 6

1 x 6 = 6

2 x 6 = 12

3 x 6 = 18

4 x 6 = 24

5 x 6 = 30

Notice that 30 appears in both lists so we can stop here.

This means that the least common multiple of 5 and 6 is 30.

4 0

4 years ago

Read 2 more answers