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3 years ago

Solve this equation: -8 + -1 =

Mathematics

2 answers:

riadik2000 [5.3K]3 years ago

5 0

The answer for that would be -9

Kruka [31]3 years ago

3 0

The answer will be 9 because the numbers both have a negative sign

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11 12 13 14 A customer buys 17.01 in gas and requests one five dollar [$5] lottery ticket, two one dollar

Dafna11 [192]

The customer gave me:
-- a ticket worth $5
-- a ticket worth $2
-- a bill worth $100
   Total. . . . . . .$107

I gave him:
-- some gas worth $17.01
-- a ticket worth    $ 5
-- two $1 tickets $ 2
-- a ticket worth    $ 3
Total. . . . . . . .$27.01

The total value of everything we trade has to be equal.

I owe him ( $107.00 - $27.01 ) =   $79.99 in change

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3 years ago

Appreciate all the help :)<br> Which matrix multiplication is defined?

zubka84 [21]

Answer:

c. BC

Step-by-step explanation:

It is the possible one

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2 years ago

Need help to do this step by step please <br> 3x2 - 2x=-1

sdas [7]

Answer:

Solving the expression $3x^2-2x=-1$ we get: $\mathbf{x=\frac{1+\sqrt{2}i }{3}\:or\:x=\frac{1-\sqrt{2}i }{3}}$

Step-by-step explanation:

We need to solve the expression: $3x^2-2x=-1$

This is a quadratic expression and it can be solved using quadratic formula

Solving:

$3x^2-2x=-1\\$

we can write it as:

$3x^2-2x+1=0$

The quadratic formula is: $x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

where a = 3, b = -2 and c= 1

Putting values and solving:

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\\x=\frac{-(-2)\pm\sqrt{(-2)^2-4(3)(1)}}{2(3)}\\x=\frac{2\pm\sqrt{4-12}}{2(3)}\\x=\frac{2\pm\sqrt{-8}}{6}\\We\:know\:that\:\sqrt{-1}=i\\x=\frac{2\pm\sqrt{8}\sqrt{-1} }{6} \\We\:know\:\sqrt{8}=\sqrt{2\times 2 \times 2}=\sqrt{2^2 \times 2}=2\sqrt{2} \\x=\frac{2\pm2\sqrt{2}i }{6}\\Now,\\x=\frac{2+2\sqrt{2}i }{6}\:or\:x=\frac{2-2\sqrt{2}i }{6}\\x=\frac{2(1+\sqrt{2}i) }{6}\:or\:x=\frac{2(1-\sqrt{2}i) }{6}\\x=\frac{1+\sqrt{2}i }{3}\:or\:x=\frac{1-\sqrt{2}i }{3}$

So, solving the expression $3x^2-2x=-1$ we get: $\mathbf{x=\frac{1+\sqrt{2}i }{3}\:or\:x=\frac{1-\sqrt{2}i }{3}}$

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2 years ago

What % of 3 1/3 is 6 1/4? I'm stuck...

BigorU [14]

You can manipulate the number to make them easier to handle

3 and 1/3 times 12=36+4=40
6 and 1/4 times 12=72+3=75
so is 40=100% then wha is 75
40 and 75
divide by 2
20 and 37.5
multiply by 5
100 and 187.5
100=100% and 187.5=187.5%
187.5-100=87.5%

87.5% increase

6 0

3 years ago

In 2009 the city of Houston, Texas, had a population of 2, 257, 926. Find the place value of the 5 in 2,257,926

fredd [130]

50,000 is the answer

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3 years ago