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4 years ago

If a person types 300 words in 5 minutes with 5 errors what is their typing speed?

Mathematics

2 answers:

GenaCL600 [577]4 years ago

7 0

The answer would be 60 miles per hour

lozanna [386]4 years ago

3 0

Their typing speed would be 60 words (with 1 error mistake) per minute. This is because 300 over 5 divided by 5 over 5 (to get the unit rate) would be 60 over 1.

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Find all the zeros of the equation. -x^3-3x^2=6x+4

k0ka [10]

Answer:

The zeros of given expression $-x^3-3x^2=6x+4$ is -1, $-1+i\sqrt{3}$ and $-1-i\sqrt{3}$

Step-by-step explanation:

Given expresssion is $-x^3-3x^2=6x+4$

To find zeros of given expression we have to equate the expression to zero.

ie., $-x^3-3^2-6x-4=0$

$-(x^3+3x^2+6x+4)=0$

$x^3+3x^2+6x+4=0$

By using synthetic division

-1 | 1 3 6 4

| 0 -1 -2 -4

|________________

1 2 4 0

Therefore (x+1) is a zero

Now the quadratic equation is $x^2+2x+4=0$

For quadratic equation $ax^2+bx+c=0$ we have

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

Here a=1 ,b=2 and c=4 now substitute the values

$x=\frac{-2\pm \sqrt{2^2-4(1)(4)}}{2(1)}$

$x=\frac{-2\pm \sqrt{4-16}}{2}$

$x=\frac{-2\pm \sqrt{-12}}{2}$

$x=\frac{-2\pm \sqrt{12i^2}}{2}$ where $i^2=-1$

$x=\frac{-2\pm i \sqrt{4\times 3}}{2}$

$x=\frac{-2\pm i \sqrt{4}\sqrt{3}}{2}$

$x=\frac{-2\pm 2i\sqrt{3}}{2}$

$x=2\times\frac{(-1\pm i\sqrt{3})}{2}$

$x=-1\pm i\sqrt{3}$

Therefore $x=-1+i\sqrt{3}$ and $x=-1-i\sqrt{3}$

Therefore the zeros are -1, $-1+i\sqrt{3}$ and $-1-i\sqrt{3}$

4 0

4 years ago

if a recipe calls for 0.8 cups of water per cup of water per 5/8 cups of milk. What is the unit rate per cup of milk ( with corr

Sladkaya [172]

Answer: 1.28 cups of water per cup of milk

Step-by-step explanation:

0.8 divided by 5/8 equals 1.28

verified by my teacher :)

5 0

3 years ago

Help me !!!!!!! 88points

ANTONII [103]

Divide the MAD of the 6th graders by the MAD of the 7th graders:
1.2 / 1.0 = 1.2
The answer is 1.2

5 0

3 years ago

Read 2 more answers

I Need help plzzzzzz

Marianna [84]

Answer:

With what?

Step-by-step explanation:

5 0

4 years ago

Read 2 more answers

17(w-4) +3w -27 <br><br><br> Helpppo

Simora [160]

Answer:

w = 19/4

Step-by-step explanation:

Solve for w:

-27 + 17 (w - 4) + 3 w = 0

17 (w - 4) = 17 w - 68:

17 w - 68 + 3 w - 27 = 0

Grouping like terms, 17 w + 3 w - 68 - 27 = (17 w + 3 w) + (-27 - 68):

(17 w + 3 w) + (-27 - 68) = 0

17 w + 3 w = 20 w:

20 w + (-27 - 68) = 0

-27 - 68 = -95:

20 w + -95 = 0

Add 95 to both sides:

20 w + (95 - 95) = 95

95 - 95 = 0:

20 w = 95

Divide both sides of 20 w = 95 by 20:

(20 w)/20 = 95/20

20/20 = 1:

w = 95/20

The gcd of 95 and 20 is 5, so 95/20 = (5×19)/(5×4) = 5/5×19/4 = 19/4:

Answer: w = 19/4

3 0

3 years ago