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podryga [215]
3 years ago
11

Can somebody please help with these two questions?

Mathematics
1 answer:
Nitella [24]3 years ago
6 0

Answer:

#3: x is approximately 0.37, -5.37, #4: x is approximately 4.19, -1.19

Step-by-step explanation:

You can solve using the quadratic equation or by solving with the perfect square

\frac{-b+/-\sqrt{b^{2}-4ac} }{2a} = x^{2}+5x-2=0\\ \frac{-5+/-\sqrt{5^{2}-4(1)(-2) }}{2(1)}

x is approximately 0.37, -5.37

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Been a while since I’ve needed to not use a calculator. Why is -2X10^-18 (3/16) = 4.09X10^-19?
Anestetic [448]

Answer:

see the explanation

Step-by-step explanation:

we have

2.18*10^{-18}(\frac{3}{16})

we have that

\frac{3}{16}=0.1875

Convert to scientific notation

0.1875=1.875*10^{-1}

substitute

2.18*10^{-18}(1.875*10^{-1}})

Remember that

To multiply two numbers in scientific notation, multiply their coefficients and add their exponents

2.18*10^{-18}1.875*10^{-1}}=(2.18*1.875)*10^{(-18-1)}=4.0875*10^{-19}

Round the number 4.0875 two decimal places

so

4.0875*10^{-19}=4.09*10^{-19}

8 0
3 years ago
What are the rules to remember when dividing fractions?
harkovskaia [24]

Answer:

copy the first fraction, turn the division sign to a multiplication sign and flip the second fraction

Step-by-step explanation:

ex: 2/5 divided by 1/4

turn it to- 2/5 x 4/1

5 0
3 years ago
Read 2 more answers
Given the circumference of a circle is 26 pi, what is the area of the circle? Show work. Leave answer in term of pi.
Ierofanga [76]

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Step-by-step explanation:

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26pi/2pi=(2pi x r)/2pi

13=r

Radius(r)=13

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8 0
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How do you write 0 .25 in a fraction?
tatuchka [14]
0.25 in a fraction would be 1/4
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If 38 = 11 + 3x, what is the value of x ?
Serhud [2]

Answer:

38-11=3x

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3 years ago
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