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sertanlavr [38]
3 years ago
7

Quiz 3

Mathematics
1 answer:
andrezito [222]3 years ago
4 0
It is 2x+8!!!!!!! I’m pretty sure
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Help me please !!<br> I need this ASAP please helpppp
Kobotan [32]

Answer:

C

Step-by-step explanation:

y=(2x-3)/5

5y=2x-3

(5y+3)/2=x

(5x+3)/2=y

f^{-1}(x)=(5x+3)/2

8 0
3 years ago
Plz, help me I will give you a brainlist and Extra points. If you help me.
stiv31 [10]

Answer:

B) (4/9 x 20)-3

8 0
3 years ago
A certain prescription drug diminishes in the system at a rate of 25% per hour. If a person was administered 1450mg of the drug,
Helen [10]

9514 1404 393

Answer:

  • 459 mg
  • about 20 hours

Step-by-step explanation:

The decay factor is 1 -25% = 0.75 per hour, so the exponential equation can be written ...

  r(t) = 1450·0.75^t . . . . . milligrams remaining after t hours

__

a) After 4 hours, the amount remaining is ...

  r(4) = 1450·0.75^4 ≈ 458.79 . . . mg

About 459 mg will remain after 4 hours.

__

b) To find the time it takes before the amount remaining is less than 5 mg, we need to solve ...

  r(t) < 5

  1450·0.75^t < 5 . . . . use the function definition

  0.75^t < 5/1450 . . . . divide by 1450

  t·log(0.75) < log(1/290) . . . . . take logarithms (reduce fraction)

  t > log(1/290)/log(0.75) . . . . . divide by the (negative) coefficient of t

  t > 19.708

It will take about 20 hours for the amount of the drug remaining to be less than 5 mg.

7 0
2 years ago
William travels only on Saturdays and Sundays and has flown 400 miles this month. Jason travels every weekday and has flown 500
Artyom0805 [142]
Let's assume that a month has four weeks.

If William made 400 miles by travelling only on Saturdays and Sundays and there were 4 weekends during the month, then he travels 400 / 4 = 100 miles during a weekend, which is 100 / 2 = 50 miles a day.

If Jason travels every weekday during the month and he does 500 miles, then he travels 500 / 20 = 25 miles a day.

It means that William travels more miles per day.
5 0
3 years ago
Your school is planning a held trip to the 200. There are two different bus companies that the school can use. The school wants
photoshop1234 [79]

Answer:

for bus A if there is OVER 40 studentsbus b will cost less

5 0
2 years ago
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