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Ksju [112]
2 years ago
13

In 12 hours , the temperature fell steadily from 17F to -7F. What was the change in temperature

Mathematics
1 answer:
r-ruslan [8.4K]2 years ago
8 0

Answer:

the change was 24F

Step-by-step explanation:

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Someone ask me to solve this.
Semenov [28]
X=2h, y=3k

Substitute these values into equations.

y+2x = 4 ------> 3k+2*2h=4 ----->  3k +4h =4

2/y - 3/2x = 1-----> 2/3k -3/(2*2h) = 1 ------> 2/3k - 3/4h =1

We have a system of equations now.

 3k +4h =4          ------> 3k = 4-4h ( Substitute 3k in the 2nd equation.)
2/3k - 3/4h =1

2/(4-4h) -3/4h = 1
2/(2(2-2h)) - 3/4h = 1
1/(2-2h) -3/4h - 1=0

4h/4h(2-2h) -3(2-2h)/4h(2-2h) - 4h(2-2h)/4h(2-2h) =0

(4h- 3(2-2h) - 4h(2-2h))/4h(2-2h) = 0
Numerator should be = 0
4h- 3(2-2h) - 4h(2-2h)=0

Denominator cannot be = 0
4h(2-2h)≠0

Solve equation for numerator=0
4h- 3(2-2h) - 4h(2-2h)=0
4h - 6+6h-8h+8h² =0
8h² +2h -6=0
4h² + h-3 =0
(4h-3)(h+1)=0
4h-3=0, h+1=0
h=3/4  or h=-1

Check which
4h(2-2h)≠0
1) h= 3/4  , 4*3/4(2-2*3/4)=3*(2-6)= -12 ≠0, so we can use h= 3/4
2)h=-1, 4(-1)(2-2*(-1)) =-4*4=-16 ≠0, so we can use h= -1, also.

h=3/4, then  3k = 4-4*3/4 =4 - 3=1 , 3k =1, k=1/3
h=-1, then  3k = 4-4*(-1) =8 , 3k=8, k=8/3 

So,
if h=3/4, then  k=1/3,
and if h=-1, then  k=8/3 .




6 0
2 years ago
Mr. Shaw need 27 markers. He can buy them in pack of 10 markers or as single markers. What are all the different ways. Mr. Shaw
Aleks [24]
Times by 10 then add 7
3 0
2 years ago
0.5 is ten times as great as?
GarryVolchara [31]
Let's cut the chit chat, and formalities. I'm not one for greetings or unnecessary niceties. 

Divide 0.5 by 10=
0.05

Check work.
0.05 x 10 = 0.5

3 0
3 years ago
Read 2 more answers
Please help ill mark brainliest
posledela

Answer:

x = 3

Step-by-step explanation:

since it's hitting 3 on the x axis and just goes up and down where 3 is, all the points have an x of 3 and nothing else. making the equation x = 3

7 0
2 years ago
The slope of this graph is?
AURORKA [14]
The slope of the graph is -1/2 using the rise over run method it rises up one and too the left twice so it would he -1/2
3 0
2 years ago
Read 2 more answers
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