3 years ago

The density of ethanol is around 0.8g/mL. What is the mass of 20mL of ethanol?

Mathematics

1 answer:

Harman [31]3 years ago

4 0

Answer: 0.7893g//mL

If 20 mL of ethanol (density =0.7893g//mL) is mixed with 40mL water (density = 0.9971g//mL)

Step-by-step explanation:

You might be interested in

Which formula could be used to find the volume of a cube with side length equal to s?

aliina [53]

Answer:

s cubed

Step-by-step explanation:

bc volume is length times width times height so it would be s times s times s which is s cubed

6 0

3 years ago

I need help with this math problem!

Lyrx [107]

Answer:

12?

Step-by-step explanation:

i might be wrong, but from what it looks like, it shows 3 sections and one is labeled 4.

8 0

3 years ago

If x=-7 is a root of the equation x^2+kx+49=0, then k=

aleksley [76]

Answer:

$k=14$

Step-by-step explanation:

Given:

$x^{2}+kx+49 = 0$

$x = -7$

Substitution can be used to find the value of $k$ :

$(-7)^{2}+(-7)k+49 = 0$

$49-7k+49 = 0$

$98 -7k = 0$

$k = 14$

Hope this helps :)

8 0

3 years ago

The ratio of girls to boys who participated in the quiz bowl was 7:5. There were 42 girls in the competition. How many boys part

Zinaida [17]

The way i do it, is sort of like this :

Is 7 a factor of 42?
Is 5 a factor of 42?

7 is a factor of 42.
It must be in multiples of 7!

Therefore, we have 5 on the other side, which makes it 5 x 7 = 35

7 0

3 years ago

If there are 21 values in a data set in order from smallest to largest, what is the third quartile of the data set?

WARRIOR [948]

Answer:

Step-by-step explanation:

3 0

3 years ago