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zavuch27 [327]
3 years ago
13

PLEASE HELP

Mathematics
1 answer:
ruslelena [56]3 years ago
4 0

Answer:

Rosaria purchased 50 bracelets and 70 necklaces

Step-by-step explanation:

Let the number of bracelets be b and the number of necklaces be n

b + n = 120 •••••(i)

Secondly;

10b + 11n = 1270 ••••(ii)

Total cost of b bracelets at 10 per 1 is 10b

Total cost of n bracelets at 11 per 1 is 11n

Adding both gives 1270

From i, b = 120-n

Substitute this into ii

10(120-n) + 11n = 1270

1200 - 10n + 11n = 1270

n = 1270-1200

n = 70

b = 120-n

b = 120-70

b = 50

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After a special medicine is introduced into a petri dish containing a bacterial culture, the number of bacteria remaining in the
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Answer:

The bacterial culture loses  \dfrac{5}{8}  of its size every 7 seconds.

Step-by-step explanation:

The relationship between the elapsed time t, in seconds, and the number of bacteria, N(t), in the petri dish is modeled by the function:

N(t)=4900\cdot\left(\dfrac38\right)^{t/7}

Since the growth factor is less than 1, it is a decay equation.

\dfrac38=1-\dfrac58\\N(t)=4900\cdot\left(1-\dfrac58\right)^{t/7}

Observe that the time t is divided by 7.

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We can therefore say that the bacterial culture loses \dfrac{5}{8}  of its size every 7 seconds.

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4 years ago
Write this percent as a fraction. 56 1/4 % (56 whole number and 1/4)
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56\frac{1}{4} %

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4 years ago
Are angles 1 and angle 4 vertical? Are angles 3 and angle 5 vertical?
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All of them are not vertical angles.

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3 years ago
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If a cordinate set (x,y) has two different scale factors this is a valid transformation..
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I’m going to say A.yes but I’m not sure sorry.
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3 years ago
10 COINS TO BEST ANSWER
podryga [215]
For quadratic
.. ax^2 +bx +c = 0
the discriminant is
.. d = b^2 -4ac

You have
.. a = 2
.. b = -5
.. c = 7
so the value of the discriminant for your equation is
.. (-5)^2 -4(2)(7)
.. = 25 -56
.. = -31

Because the discriminant is negative, the roots of the quadratic are complex.

Reasoning: this is the usual interpretation of the sign of the discriminant. It derives from the fact that the square root of the discriminant is part of the roots of the quadratic. That part will be imaginary when the discriminant is negative.

_____
The graph shows there are no real roots.

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3 years ago
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