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3 years ago

15

Of 560 marbles in a bag, 65% are red and the rest are blue. After 28 red marbles are replaced with blue ones, how many blue marb

les need to be added to the bag so that the 65% of all marbles are blue?

1 answer:

Kobotan [32]3 years ago

6 0

Answer:

140

Step-by-step explanation:

It's confusing, just believe me.

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3 years ago

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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 $k$ :

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

$49-7k+49 = 0$

$98 -7k = 0$

$k = 14$

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3 years ago

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Flura [38]

Answer:

r=4 d=8 a = 16π c = 8π

d=6 r=3 a=9π c=6π

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Step-by-step explanation:

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3 years ago

On a scale drawing, the scale factor is 1/12. A plum tree is 7 inches tall on the scale drawing. What is the actual height of th

Sedbober [7]

B. 84

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3 years ago

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The sales tax for an item was $24.50 and it cost $490 before tax.

Ymorist [56]

The sales tax rate is 5%.

Step-by-step explanation:

Given,

Sales tax for an item = $24.50

Cost of item before tax = $490

Sales tax rate = $\frac{Sales\ tax}{Cost\ of\ item}*100\\$

$Sales\ tax\ rate=\frac{24.50}{490}*100\\\\Sales\ tax\ rate=\frac{2450}{490}\\\\Sales\ tax\ rate=5\%$

The sales tax rate is 5%.

Keywords: sales tax, percentage

Learn more about percentages at:

#LearnwithBrainly

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3 years ago