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Slav-nsk [51]
3 years ago
15

What is 3 times -3 Please help me

Mathematics
2 answers:
Lyrx [107]3 years ago
8 0
-9 because if you multiply a positive by a negative it equals a negative.
Alex_Xolod [135]3 years ago
5 0

Answer: -9

Step-by-step explanation:

"3 times -3" indicates a multiplication. Then, rewriting it, this is:

(3)(-3)

Now, in order to solve the given multiplication, the first thing you need to remember is multiplication of signs:

(+)(+)=+\\(-)(-)=+\\(+)(-)=-

Notice that one factor is positive and the other one is negative. Then, the product will be negative.

Therefore, the product is:

 (3)(-3)=-9  

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4 years ago
Write an equation of the perpendicular bisector of the segment with end points M(1,5) and N(7,-1)
vitfil [10]
The perpendicular bisector of the segment passes through the midpoint of this segment. Thus, we will initially find the midpoint P:

P=\dfrac{(1,5)+(7,-1)}{2}=\dfrac{(8,4)}{2}=(4,2)

Now, we will calculate the slope of the segment support line (r). After this, we will use the fact that the perpendicular bisector (p) is perpendicular to r:

m_r=\dfrac{\Delta y}{\Delta x}=\dfrac{5-(-1)}{1-7}=\dfrac{6}{-6}\iff m_r=-1


p\perp r\Longrightarrow m_p\cdot m_r=-1\Longrightarrow m_p\cdot(-1)=-1\iff m_p=1

We can calculate the equation of p by using its slope and its point P:

y-y_P=m_p(x-x_P)\\\\
y-2=1\cdot(x-4)\\\\
y-2=x-4\\\\
\boxed{p:~~y=x-2}
4 0
3 years ago
Given the expression (8 + 6i) − (−2 + 7i), perform the indicated operation and write the answer in the form a + bi
Oliga [24]
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---
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6 0
3 years ago
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Maru [420]

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minus 7a plus 11

Step-by-step explanation:

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3 0
3 years ago
How many grams NaCl would you use to make a 4M solution in 100ml
MatroZZZ [7]

Answer:

Amount of NaCl = 23.376 gram

Step-by-step explanation:

Given:

Molarity = 4M

Volume of solution = 100 ml

Find:

Amount of NaCl

Computation:

Molar mass of Na = 22.99 g/mole

Molar mass of Cl = 35.45 g/mole

Molar mass of NaCl =  22.99 + 35.45

Molar mass of NaCl  = 58.44 g/mole

Molarity = [moles of solute / volume of solute(ml)]1,000

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Moles of solute = 0.4

moles of solute = Mass of solute / molar mass

0.4 = Amount of NaCl / 58.44

Amount of NaCl = 23.376 gram

8 0
3 years ago
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