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3 years ago

Why does -30 - - 50 equal 20? What steps are being done?

Mathematics

2 answers:

12345 [234]3 years ago

7 0

Answer:

Step-by-step explain

1. 30-50=20

2. Two negatives equal a positive

So first you subtract 30 by 50 and get 20 then you look at the signs which are both negative. Meaning both of the negative signs become a positive. (-30)-(-50)=20

ale4655 [162]3 years ago

6 0

Two negatives equal a positive, so its just like subtracting 50 and 30, but your answer will be a positive.

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Answer:

Step-by-step explanation:

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1 year ago

The common ratio of a geometric series is 3 and the sum of the first 8 terms is 3280.

Pavlova-9 [17]

Answer:

The first term of the geometric series is 1

Step-by-step explanation:

In this question, we are tasked with calculating the first term of a geometric series, given the common ratio, and the sum of the first 8 terms.

Mathematically, the sum of terms in a geometric series can be calculated as;

S = a(r^n-1)/( r-1)

where a is the first term that we are looking for

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Plugging these values, we have

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2 years ago

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3 years ago

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Step-by-step explanation:

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3 years ago

Read 2 more answers

What are the zeros of the function f(x) = x2 + 5x + 5 written in simplest radical form?

RideAnS [48]

Step-by-step explanation:

The function is as follows :

$f(x) = x^2 + 5x + 5$

We need to find the zeroes of the function in the simplest radical form.The zero of the above function is given by :

$x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}$

Here,

b = 5

a = 1

c = 5

So,

$x=\dfrac{-5\pm \sqrt{5^2-4\times 1\times 5} }{2(1)}\\\\x=\dfrac{-5\pm \sqrt{25-20} }{2(1)}\\\\x=\dfrac{-5\pm \sqrt{5} }{2}$

Hence, the correct option is (c).

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3 years ago