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Korvikt [17]
2 years ago
7

tại teamart,1 ly trà sữa có giá a đồng và 1 ly kem có giá là b đồng.Hãy viết biểu thức đại số biểu thị số tiền bạn Cúc mua 3 ly

trà sữa và 4 ly kem
Mathematics
1 answer:
Lesechka [4]2 years ago
8 0

Answer:

3 a + 4 b

Step-by-step explanation:

Biểu thức đại số biểu thị bạn Cúc mua  3  ly trà sữa và  4  ly kem là:

3 a + 4 b

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PLEASE HELP ME ASAP!!
snow_tiger [21]

point slope form means (y-y1)=m(x-x1)

so u need to find the slope gradient from those 2 points

m=y2-y1/x2-x1

=-6-6/11-7

=-12/4

=-3

and finally x1,y1=7,6

(y-y1) =m(x-x1)

(y-6) =-3(x-7)

7 0
2 years ago
31. Students are going through a three-step process to obtain their ID cards. Each student will spend 2 minutes at the registrat
mars1129 [50]

Answer:

The answer is 72 minutes.

Step-by-step explanation:

The first step will be the registration desk, which last 2 minutes.

The second step is going to one of the three cashiers, this step takes 10 minutes.

The third step is to visit one of the four ID processing stations, to take their picture and to print the ID card. this step take 20 minutes.

Demand rate= 0.5 students per minute

This means 1 student every 2 minutes.

The total amount of time of the three-step process  is 32 minutes.

During 40 minutes 20 students will start their process. These means that the student number 20 will start his/hers process at the minute number 40 of the whole process. As he/she is the last one, no one will finish their process before him/her.

The process takes 32 minutes.

We just need to add 40 minutes to the total amount of time of the three-step process takes, which is 32 minutes.

time=40+32=72 minutes

Therefore to process 20 students it will take 72 minutes.  

7 0
3 years ago
Can someone please help me with this math problem
Vlada [557]

We have f\left(f^{-1}(x)\right) = x for inverse functions f(x) and f^{-1}(x). Then if f(x) = 2x+5, we have

f\left(f^{-1}(x)\right) = 2f^{-1}(x) + 5 = x \implies f^{-1}(x) = \dfrac{x-5}2

Then

f^{-1}(8) = \dfrac{8-5}2 = \boxed{\dfrac32}

7 0
2 years ago
From a full 50-liter container of a 40% concentration of acid, x liters are removed and replaced with 100% acid. (A) Write the a
padilas [110]

Answer:

See explanation

Step-by-step explanation:

Given:

50 liter container

40% concentration of acid

x liters are removed and replaced with 100% acid

(A)

Acid in 50-liter container =  40% of 50 liters

                                          = (40/100) * 50

                                          = 0.4 * 50

                                          = 20

So there are 20 liters amount of acid in 50 liter container.

Now x liters are removed and replaced with 100% acid

The acid in x-liter

40% of x liters = (40/100) * x  = 0.4 * x

When x liters are removed then amount of acid that remained in container:

20 - 40% of x liters = 20 -  (40/100) * x  = 20 - 0.4 * x

This can also be written as:

(50-x) (40/100) =  (40*50/100) - (40*x/100) = 2000/100 - 40x/100 =  20 - 2x/5

Since x liters replaced with 100% acid so this becomes:

20 - 40% of x liters + 100% of x liters

= 20 -  (40/100) * x + 100/100 * x

= 20 - (40/100) x + (100/100)x

= 20 +  (100-40/100)x

= 20 + (60/100)x

= 20 + 0.6 x    

This can also be written as:

20 - 2x/5 + x = 20 + 3x/5 =  20 + 0.6 x

Hence the amount of acid in the final mixture as a function of x:

f(x) = 20 + 0.6 x

(B)

The value of x can not be greater than 50 liters and can not be lesser than 0 liters.  

so, range is [0, 50] where both 0 and 50 are inclusive.  

(C)

Since final mixture is 50% acid So

Acid = 50% of 50 litres =

        = (50/100) * 50

        = 1/2 * 50

         = 50/2

        = 25

Put 25 in the computed function of x

20 + 0.6 x = 25

0.6x = 25 - 20

0.6x = 5

x = 5/0.6

x = 8.333333

x = 8.3 liters

3 0
3 years ago
If SK=13x-5,KY=2x+9, and SY=36-x find each value
scZoUnD [109]

SY = SK+KY

36–x = (13x-5) + (2x+9)

13x+2x+x= 36+5-9

16x= 32

x= 32/16

x= 2

<h3>x= 2</h3><h3 />

SK= 13x-5 = 13(2)-5=26-5=21

<h3>SK=21</h3>

KY=2x+9=2(2)+9=4+9=13

<h3>KY=13</h3>

SY=36-X= 36-2=34

<h3>SY= 34</h3>

<h3>SO; </h3><h3 /><h3>X=2 </h3><h3 /><h3>Sk=21 </h3><h3 /><h3>KY=13 </h3><h3 /><h3>SY=34</h3>

I hope I helped you^_^

8 0
3 years ago
Read 2 more answers
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