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3 years ago

It takes Ivanna 3 minutes to complete 2 problems on her math homework . How long will it take Ivanna to complete 12 problems?

Mathematics

2 answers:

antiseptic1488 [7]3 years ago

7 0

It will take her 18 minutes to complete 12 promblems you welcome

Oksana_A [137]3 years ago

5 0

18 you multiply the 6 to the 3 so if it took her 3 minutes for 2 it will take her 18 minutes for 12

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Does have an inverse? Why or why not?

Mkey [24]

A square matrix is invertible if its determinant is not zero.

The determinant for this matrix is

$\begin{vmatrix}4&8\\7&14\end{vmatrix} = 4\cdot14 - 8\cdot7 = 56 - 56 = 0$

so it does not have an inverse because its determinant is zero.

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3 years ago

Approximately how many times greater is 2.3x10^-4 than 1.15x10^-8 ?

Minchanka [31]

Answer:

2.3 × $10^{-4}$ is 20,000 times greater than 1.15 × $10^{-8}$

Step-by-step explanation:

Given as :

The first number= x = 2.3 × $10^{-4}$

The second number= y = 1.15 × $10^{-8}$

Let The first number is z times greater than second number

i.e x = z × y

Or, z = $\dfrac{x}{y}$

Or, z = $\dfrac{2.3\times 10^{-4}}{1.15\times 10^{-8}}$

Or, z = 2 × $10^{4}$

∴ z = 20,000

So,The first number is 20,000 times greater than second number

Hence, 2.3 × $10^{-4}$ is 20,000 times greater than 1.15 × $10^{-8}$ . Answer

3 0

4 years ago

How do I do this problem

Lena [83]

First you multiply 3 times x and 3 times 2

4(3(x + 2) -1) =50

and get

4( 3x +6 -1) =50

then you add 6 plus -1

4 ( 3x +5) = 50

then multiply 4 times 3x and 4 times 5

12x +20 = 50 and subtract 20 from both sides

-20 -20

and you will get

12x = 30

divided both sides by 12

12x/12 = 30/12

then you find the ones that are the same amount in decimals but are smaller

and that's your answer: x= 5/2

hope you get it!!!

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3 years ago

A barrel holds 50 l, how many gallons is this?

scoundrel [369]

The barrel holds 13.20 liters

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3 years ago

A painter uses 1.2 liters of the paint to cover 1m^2of the wall.

Hitman42 [59]

The amount of paint used is <u>8.4 litres</u>.

<h3>EXPLANATION</h3>

To work this out, you need to<em> times 1.2 by 7</em>, to get the answer of <u>8.4 litres</u>.

Hope this helps!

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4 years ago