Answer: 1350
Step-by-step explanation:
Here is the correct question.
Raquel can type an average of 63 words per minute. Rick can type 73 words per minute. how many more words can Rick type than Raquel in 135 minutes? Jared chose B as the correct answer. How did he get that answer? Jared said the answer is 4599. How did he get that answer?
Rick's word per minute= 73
Raquel's word per minute= 63
Ricks word in 135minute= 73×135 = 9855
Raquel's word in 135 minutes=63×135 = 8505
=9855 - 8505
= 1350
Rick can type 1350 more words than Raquel in 135 minutes.
Jared's answer is wrong. He got the answer by multiplying 63 by 73 which gives 4599.
Answer:
(-∞, 0) U (8, ∞)
Step-by-step explanation:
Expression without an equal sign with at least one variable
Hope this helps!
Answer:
Therefore the value of x is
![x=1\pm\sqrt{19}i](https://tex.z-dn.net/?f=x%3D1%5Cpm%5Csqrt%7B19%7Di)
Step-by-step explanation:
Given:
which is
![x^{2}-2x+20=0](https://tex.z-dn.net/?f=x%5E%7B2%7D-2x%2B20%3D0)
To Find:
x = ? using Quadratic Formula
Solution:
For a Quadratic Equation ax² + bx + c = 0 , Formula Method is given as
![x=\dfrac{-b\pm\sqrt{b^{2}-4ac}}{2a}](https://tex.z-dn.net/?f=x%3D%5Cdfrac%7B-b%5Cpm%5Csqrt%7Bb%5E%7B2%7D-4ac%7D%7D%7B2a%7D)
On Comparing with above we get
![a=1\\b=-2\\c=20](https://tex.z-dn.net/?f=a%3D1%5C%5Cb%3D-2%5C%5Cc%3D20)
Substituting a , b , c in Formula method we get
![x=\dfrac{-(-2)\pm\sqrt{(-2)^{2}-4(1)(20)}}{2\times 1}\\\\x=\dfrac{2\pm\sqrt{-76}}{2}\\\\x=\dfrac{2\pm2\sqrt{19}i}{2}\\Dividing\ by\ 2\ we\ get\\\\x=1 \pm\sqrt{19}i](https://tex.z-dn.net/?f=x%3D%5Cdfrac%7B-%28-2%29%5Cpm%5Csqrt%7B%28-2%29%5E%7B2%7D-4%281%29%2820%29%7D%7D%7B2%5Ctimes%201%7D%5C%5C%5C%5Cx%3D%5Cdfrac%7B2%5Cpm%5Csqrt%7B-76%7D%7D%7B2%7D%5C%5C%5C%5Cx%3D%5Cdfrac%7B2%5Cpm2%5Csqrt%7B19%7Di%7D%7B2%7D%5C%5CDividing%5C%20by%5C%202%5C%20we%5C%20get%5C%5C%5C%5Cx%3D1%20%5Cpm%5Csqrt%7B19%7Di)
Therefore the value of x is
![x=1\pm\sqrt{19}i](https://tex.z-dn.net/?f=x%3D1%5Cpm%5Csqrt%7B19%7Di)
He would have gotten 24 right out of 30 questions to get 80% on his 3rd test