MATHEMATICS HIGH SCHOOL

What's the answer for 7r-5=10

Answers

Answer 1

Answer:

Hi Brainiac

7r= 10+5

7r= 15

Divide both sides by 7

7r/7= 15/7

r= 5/7

or the decimal will be r= 2.14

I hope that's help:0

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Please help thanks so much for your kind effort

Answers

Answer:

Step-by-step explanation:

dy/dx = 2x +4 = 2*1 +4 = 6

Which inequality has no solution?6(x+2)> x-3

3+4x<2(1+2x)

-2(x+6)< x-20

x-9 < 3 (x-3)

Answers

Hello,

Answer B

3+4x<2(1+2x)
==>3+4x<2+4x
==>3<2 is False => no solution for x.

Answer: The answer is B, 3+4x<2(1+2x).

Step-by-step explanation:

Use this figure to find value of FOD

Answers

The correct answer is C.

Answer:

Step-by-step explanation:

HELP PLEASE ASAP!! Which relation is a function?

Answers

Answer:

The one on the bottom left.

Step-by-step explanation:

To find out which one is a function, we would use the vertical line test. First you create a vertical line with your finger, pencil, or another object. If there are two dots that pass a vertical line, it would not be a function. Only one dot can cross the vertical line for it to be a function.

joe is preparing 18 hot dogs for his party. However, Joe only has 12 hot dog buns. How many more hot dog buns does Joe need?*

Answers

Its quite simple. Its just subtraction.
18 hotdogs - 12 hotdog buns = 6 hotdug buns still needed

18-12= 6
6 is the amount of hotdog buns needed.

You subtract 12 from 18 because you already have that amount of buns and need to see how many you need to get.

A cup of coffee at 181 degrees is poured into a mug and left in a room at 66 degrees. After 6 minutes, the coffee is 139 degrees. Assume that the differential equation describing Newton's Law of Cooling is (in this case) dT/dt=k(T-66).1) What is the temperature of the coffee after 16 minutes?
2) After how many minutes will the coffee be 100 degrees?

Answers

The temperature of the coffee after 16 minutes is 134 degrees and after 1.3 minutes the coffee be 100 degrees.

What is Differential equation?

A differential equation is an equation that contains one or more functions with its derivatives.

A cup of coffee at 181 degrees is poured into a mug and left in a room at 66 degrees.

After 6 minutes, the coffee is 139 degrees.

Assume that the differential equation describing Newton's Law of Cooling is (in this case) dT/dt=k(T-66).

T=∫k(t-66)dt

=k(t²/2-66)+c

When t=0 and T=181

181=k(0-66)+c

181=-66k+c

when t=6, T=139

139=k(6²/2-66)+c

139=-48k+c

-42=-18k

Divide both sides by 18

k=7/3

139=-48×7/3+c

c=139+112=251

T=7/3(t-66)+251

The temperature of the coffee after 16 minutes

T=7/3(16-66)+251

T=7/3(-50)+251

T=134 degrees

After how many minutes will the coffee be 100 degrees

100=7/3(t-66)+251

100=7/3t-7/3(66)+251

100=7/3t-154+251

100=7/3t+97

100-97=7/3t

3=7/3t

9/7=t

1.3=t

Hence, the temperature of the coffee after 16 minutes is 134 degrees and after 1.3 minutes the coffee be 100 degrees.

To learn more on Differentiation click:

brainly.com/question/24898810

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Answer:

Step-by-step explanation:

$(dT)/(dt) =k(t-66)\nT=\int\ {k(t-66)} \, dt=K((t^2)/(2) -66)+c\nwhen t=0,T=181\n181=K(0-66)+c\n181=-66k+c\nwhen t=6,T=139\n139=k((6^2)/(2) -66)+c\n139=-48k+c\n181-139=-66k+48k\n-42=-18k\n7=3k\nk=(7)/(3) \n139=-48*(7)/(3) +c\nc=139+112=251\nT=(7)/(3) (t-66)+251\nnow complete the question$

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