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andrey2020 [161]
4 years ago
9

Tell whether x and y are in a proportional relationship. if so, find the unit rate. Let y be the temperature x hours after midni

ght. The temperature is 60 degrees Fahrenheit at midnight and decreases 2 degrees Fahrenheit every 1/2 hour.
a. yes, 1 degree Fahrenheit per hour
b. yes, 2 degrees Fahrenheit per hour
c. yes, 4 degrees Fahrenheit per hour
d. no
Mathematics
1 answer:
lesantik [10]4 years ago
3 0
C. yes, 4 degrees F per hour
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Mike saves $42 a week for 7 weeks. During his 8-day vacation, he plans to spend $8.25 each day for snacks. Which expression show
Alla [95]
The answer is B, because you will have to multiple 42 by 7 to see how much money he will have in 7 weeks and then you will have to subtract 8 × 8.25 to see how much money he spent on his vacation.
5 0
3 years ago
Jim walked 1/2 of a mile in 1/4 of an hour. at this rate how long will it take him to walk one mile
Kay [80]

Answer:

1/4=25 minutes an hour

25×2=50

it will take him 50 minutes

6 0
3 years ago
Verify that the roots of 5x²- 6x -2 = 0 are <img src="https://tex.z-dn.net/?f=%5Cfrac%7B3%20%2B%20%5Csqrt%7B19%7D%20%7D%7B5%7D%2
Mice21 [21]

Answer:

Proof below.

Step-by-step explanation:

<u>Quadratic Formula</u>

x=\dfrac{-b \pm \sqrt{b^2-4ac} }{2a}\quad\textsf{when }\:ax^2+bx+c=0

<u>Given quadratic equation</u>:

5x^2-6x-2=0

<u>Define the variables</u>:

  • a = 5
  • b = -6
  • c = -2

<u>Substitute</u> the defined variables into the quadratic formula and <u>solve for x</u>:

\implies x=\dfrac{-(-6) \pm \sqrt{(-6)^2-4(5)(-2)}}{2(5)}

\implies x=\dfrac{6 \pm \sqrt{36+40}}{10}

\implies x=\dfrac{6 \pm \sqrt{76}}{10}

\implies x=\dfrac{6 \pm \sqrt{4 \cdot 19}}{10}

\implies x=\dfrac{6 \pm \sqrt{4}\sqrt{19}}{10}

\implies x=\dfrac{6 \pm2\sqrt{19}}{10}

\implies x=\dfrac{3 \pm \sqrt{19}}{5}

Therefore, the exact solutions to the given <u>quadratic equation</u> are:

x=\dfrac{3 + \sqrt{19}}{5} \:\textsf{ and }\:x=\dfrac{3 - \sqrt{19}}{5}

Learn more about the quadratic formula here:

brainly.com/question/28105589

brainly.com/question/27953354

3 0
2 years ago
Read 2 more answers
Given f(x)=5-3x, if f(x)=-19, find x
Dafna1 [17]

X would equal 8

Step-by-step explanation:

5-3(8) = -19

5 multiplied by negative 3 times 8 equals negative 19

negative 3 times 8 equals negative 24 plus 5 equals 19

7 0
3 years ago
Plz help
riadik2000 [5.3K]
  1. 4(20+22)
  2. 4(40+2)

This expression are equivalent to 4(42)

4 0
3 years ago
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