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OLga [1]
3 years ago
11

If 5 goldfish cost $6.45,what is the cost of 8 goldfish

Mathematics
2 answers:
Maru [420]3 years ago
8 0
6.45/5*8=$<span>10.32 is your answer</span>
Harrizon [31]3 years ago
7 0
Cost of 5 fishes=$6.45 Cost of 1 fish=$6.45/5 =$1.29 Cost of 8 fishes=$1.29*8 =$10.32
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Name the quadrant in which the angle is in cos theta&gt;0, csc theta&lt;0
bekas [8.4K]

Answer:

Quadrant 4

Step-by-step explanation:

Csc = 1/sin

Cos is positive in quadrants 1 and 4

Sin is negative in quadrants 3 and 4

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I’ll mark Brainly! Andy deposits $25 in his checking account.
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Answer:

1. $25

2. 12

3. -12

4. -12

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Step-by-step explanation:

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3 years ago
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3 years ago
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Find an​ nth-degree polynomial function with real coefficients satisfying the given conditions.
lesya692 [45]

Answer:

\displaystyle f(x) = -2(x-2)(x^2+4)

Step-by-step explanation:

We want to find a third degree polynomial with zeros <em>x </em>= 2 and <em>x</em> = 2i and f(-1) = 30.

First, note that by the Complex Root Theorem, since <em>x</em> = 2i is a root, <em>x</em> = -2i must also be a root.

Hence, we will have the three factors:

\displaystyle f(x) = a(x-(2))(x-(2i))(x-(-2i))

Where <em>a</em> is the leading coefficient.

Expand and simplify the second and third factors:

\displaystyle \begin{aligned} (x-(2i))(x-(-2i)) &= (x-2i)(x+2i) \\ \\ &= x(x-2i)+2i(x-2i) \\ \\ &= (x^2 - 2ix) + (2ix - 4i^2) \\ \\ &=x^2 + 4\end{aligned}

Hence:

\displaystyle f(x) = a(x-2)(x^2+4)

Since f(-1) = 30:

\displaystyle \begin{aligned}  f(x) &= a(x-2)(x^2+4) \\ \\ (30) &= a((-1)-2)((-1)^2+4) \\ \\ 30 &= -15a \\ \\ a&= -2\end{aligned}

In conclusion, third degree polynomial function is:

\displaystyle f(x) = -2(x-2)(x^2+4)

5 0
3 years ago
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