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2 years ago

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Mathematics

1 answer:

cluponka [151]2 years ago

6 0

Answer:

x=3

y=11

Step-by-step explanation:

5x + 2y = 37

y = x + 8

5x+2(x+8)=37

5x+2x+16=37

7x=21

x=3

y = (3) + 8

y=11

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The grades for class are as follows: 10 A's, 8 B's, 6 C's, 5 D's What percent received an A? (round to the nearest whole )

boyakko [2]

Answer:

34.5

Step-by-step explanation:

Add up all the numbers. 10+8+6+5=29. Then divide 29 by 100. Then multiply 10x What you got from 100/29. Sorry if thats confusing hope that helps!

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3 years ago

PLEASE ANSWER THIS QUESTION CORRECTLY AND I WILL MARK YOU AS THE BRAINLIEST

cluponka [151]

Answer:

2. $(x - 4)^2 = 23$

Step-by-step explanation:

$x^2 - 8x - 7 = 0$

$x^2 - 8x ~~~~~ = 7$

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3 years ago

A cone shaped paper water cup has a height of 12 cm and a radius of 6 cm. If the cup is filled with water to half its height, wh

monitta

Answer:

The portion of the volume of the cup that is filled with water is $\frac{1}{8}$

Step-by-step explanation:

step 1

Find the volume of the paper water cup

The volume of the cone is equal to

$V=\frac{1}{3}\pi r^{2}h$

we have

$r=6\ cm$

$h=12\ cm$

substitute

$V=\frac{1}{3}\pi (6)^{2}(12)$

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step 2

If the cup is filled with water to half its height, find out what portion of the volume of the cup is filled with water

Remember that

If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube

In this problem the similar cone has half the height of the complete cone

The scale factor is equal to 1/2

therefore

The volume of the cup that is filled with water is equal to the volume of the complete cup by the scale factor elevated to the cube

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therefore

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$\frac{1}{8}$

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3 years ago

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Centimeter is smaller than a meter

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3 years ago

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A bag contains purple marbles and white marbles, 68 in total. The number of purple marbles is 4 less than 5 times the number of

galina1969 [7]

Answer: 56 purple marbles.

Step-by-step explanation:

Let be "p" the number of purple marbles in the bag and "w" the number of white marbles in the bag.

You can set up the following System of equations:

$\left \{ {{p+w=68} \atop {p=5w-4}} \right.$

You can use the Substitution method to solve the System of equations. The steps are shown below:

1. You need to substitute the second equation into the first equation:

$(5w-4)+w=68$

2. Now you must solve for "w":

$5w-4+w=68\\\\6w-4=68\\\\6w=68+4\\\\6w=72\\\\w=\frac{72}{6}\\\\w=12$

3. Substitute the value of "w" into second original equation and then evaluate in order to find the value "p":

$p=5(12)-4\\\\p=60-4\\\\p=56$

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3 years ago