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aleksley [76]
3 years ago
13

Difference between mafic intermediate and felsic magmas

Mathematics
1 answer:
Inga [223]3 years ago
8 0

Both are indicators of the chemical composition of silicate minerals, magmas and rocks.

Mafic is used for silicate minerals, magmas and rocks that are composed of heavier elements, like magnesium, iron, calcium and sodium. They are dark and have high specific gravities.

<span>Opposite to the this, felsic silicate minerals, magmas and rocks in their composition have less from these heavy elements. They are composed from silicon, oxygen, aluminium and potassium, are light in color and have lower specific gravities.</span>

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A rabbit runs at a rate of 25 miles per hour. Write a rule to describe the function.
denis-greek [22]

For every hour a rabbit runs 25 miles.

5 0
3 years ago
A pair of sneakers on sale for 20% off if the discount is $26 what is the original cost of the the sneaker
zhenek [66]

Answer:

$32.50

Step-by-step explanation:

\frac{26}{y} :\frac{80}{100}

y · 80 = 26 · 100

80y = 2600

80y ÷ 80 = 2600 ÷ 80

y = 32.5

4 0
3 years ago
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The student council decided that for every ticket purchased, the buyer receives a certain number of entries for the raffle drawi
mariarad [96]

Answer:

45

Step-by-step explanation:

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3 years ago
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Esther is participating in a walk-a-thon. She will raise 5 dollars for her charity for each lap she walks.
avanturin [10]

Answer:

independent variable = number of laps;

dependent variable = number of dollars​

Step-by-step explanation:

If we were to put this information into a slope-intercept form equation, the equation would be: y = 5x (dollars raised = 5 dollars per lap walked). In this case, we are going to use the variables l and d instead of x and y, respectively. The equation instead of being y = 5x, it is going to be d = 5l. In the slope-intercept form X will always be the independent variable and y the dependent variable, because the number we get for Y totally depends on what you plugged in for X. In this equation, l is the independent variable (the number of laps she walks) and d is the dependent variable (number of dollars).

6 0
4 years ago
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Find the sum of the series 9+3+1+........+1/27​
Elina [12.6K]

Answer:

364/27

Step-by-step explanation:

9, 3, 1, ... is a geometric sequence with common ratio r = 1/3.

 

The nth term is a1rn-1.

 

If a1rn-1 = 1/27, then 9(1/3)n-1 = 1/27

 

                                32(3-1)n-1 = 3-3

 

                                3231-n = 3-3

 

                                    33-n = 3-3

 

                                      3-n = -3

 

                                         n = 6

 

The sum, Sn, of the first n terms of a geometric sequence is given by Sn = a1(1 - rn) / (1 - r).

 

So, 9 + 3 + 1 + ... + 1/27 = S6 = 9(1 - (1/3)6) / (1 - 1/3)

 

                                              = 9(1 - 1/729) / (2/3)

 

                                              = (27/2)(728/729) = 364/27

4 0
3 years ago
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