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2 years ago

Someone help me i don’t understand this !

Mathematics

2 answers:

Alisiya [41]2 years ago

5 0

Answer: put it in the calculator with the () and they will give it to you right like you need it

Step-by-step explanation: :)

agasfer [191]2 years ago

3 0

Answer:

I help you

Step-by-step explanation:

I help you _GUTI_ discord

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Geometry please help!!

Nostrana [21]

6.403124237432849 this is the right answer I used Pythagorean’s theorem

6 0

2 years ago

Amy has four more 20c coins than 5c coins. The total value of all her 20c and 5c is $3.80. How many 5c coins does Amy have?

skelet666 [1.2K]

Answer:

Amy has 12 5¢ coins

Step-by-step explanation:

Let <em>x</em> represent 20¢ coins and <em>y</em> represent 5¢ coins.

Amy has four more 20¢ coins than 5¢ coins. Hence:

$x=y+4$

And the total value of all her coins is $3.80. Thus:

$0.2x+0.05y=3.8$

This yields a system of equations:

$\displaystyle \begin{cases} x=y+4 \\ 0.2x+0.05y=3.8\end{cases}$

We can solve by substitution. Substitute the first equation into the first:

$\displaystyle 0.2(y+4)+0.05y=3.8$

Distribute:

$\displaystyle 0.2y+0.8+0.05y=3.8$

Combine like terms:

$\displaystyle 0.25y = 3$

And divide both sides by 0.25. Hence:

$y=12$

Thus, Amy has 12 5¢ coins.

Using the first equation:

$x=y+4$

Substitute:

$x=(12)+4=16$

Thus, Amy has 16 20¢ coins.

In conclusion, Amy has 12 5¢ coins and 16 20¢ coins.

6 0

2 years ago

Tom simplified an expression in three steps, as shown:

Aleksandr-060686 [28]

Step 3, you cannot add exponents of differing bases

8 0

2 years ago

A certain liquid has a density of 2.67 g/cm3. 30.5 mL of this liquid would have a mass of ________ Kg.

sp2606 [1]

Answer:

One ml is equal to a cm3, then

m=2.67g/cm3*30.5cm3

m=81.435g

If we divide this quantity by 1000 to pass this to Kg we get:

m=81.435/1000=0.081435kg

Step-by-step explanation:

Remember the formula of density is density=mass/volume, if we solve for mass we get:

mass=density*volume

5 0

2 years ago

Express in the form 1 : n 4 : 12

Vesna [10]

Answer:

1:3

Step-by-step explanation:

4:12 divides by 4 to give

1 : 3

3 0

2 years ago

Read 2 more answers