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4 years ago

Evaluate -2/7 - 3/8 + 1/4 + 2/7

Mathematics

1 answer:

alina1380 [7]4 years ago

8 0

Answer:

its exact form is -1/8

its decimal form is -0.125

Step-by-step explanation:

you do the math to the fractions accordingly and then simplify your answer to whichever form

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Chelsea has 11 times as many art brushes as Monique. If they have 60 art brushes altogether, how many brushes does chelsea have

Keith_Richards [23]

I did it on the calculator the answer was 0.1833333333333333 i do not know if this is correct if its incorrect then srry :(

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4 years ago

Algebraic expression 10 more than twice c score

m_a_m_a [10]

C2+ 10

Twice = multiply by two
10 more than = add ten

Hope this helps!

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3 years ago

When you answer this please show your work I

Mamont248 [21]

Answer:

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Step-by-step explanation:

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3 years ago

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A radiator contains 10 quarts of fluid, 30% of which is antifreeze. How much fluid should be drained and replaced with pure anti

prohojiy [21]

ANSWER

Find out the how much fluid should be drained and replaced with pure antifreeze so that the new mixture is 60% antifreeze .

To proof

let us assume that the fluid should be drained and replaced with pure antifreeze be x .

As given

A radiator contains 10 quarts of fluid, 30% of which is antifreeze.

Now write 30% in the decimal form

$= \frac{30}{100}$

Now write 60% in the decimal form

$= \frac{60}{100}$

After drained and replaced the fluid with pure antifreeze than the quantity becomes = ( 10 - x )

The quantity of antifreeze is

$= \frac{30\times (10 - x)}{100}$

The fluid should be drained and replaced with pure antifreeze so that the new mixture is 60% antifreeze .

than the equation becomes

$= x + \frac{30\times ( 10 - x )}{100} = \frac{60\times10}{100}$

solyving

100x +300 - 30x = 600

70x = 300

$x = \frac{300}{70}$

x = 4.28 quarts (approx)

Hence 4.28 quarts (approx) fluid should be drained and replaced with pure antifreeze so that the new mixture is 60% antifreeze .

Therefore the option (c.) is correct .

3 0

4 years ago

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What are the discriminants for all of graphs?

Oksanka [162]

Hi!

Positive discriminants will give you two solutions.

Discriminants equal to zero will give you one solution.

Negative discriminants will give you no solutions.

In a graph, the number of solutions is where the graph crosses the x-axis.

In the first graph, we can see it intersects the graph at two points: (2, 0) and (6, 0). Since there are two solutions it is a positive discriminant.

In the second graph, we can see it intersects at one point: the origin, or (0, 0). Since there is one solution it is a discriminant equal to zero.

In the third graph, we can see it doesn't intersect; it is above the x-axis. Since there are no solutions it is a negative discriminant.

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3 years ago

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