Answer:
A) R = 1900 -24t
B) 1684 billion barrels
C) 79.17 years
Step-by-step explanation:
<h3>A)</h3>
Reserves start at 1900 billion barrels and decrease by 24 billion barrels each year. The value for t=0 is 1900; the value for t=1 is 24 less.
R = 1900 -24t
__
<h3>B)</h3>
For t=9, the reserves will be ...
R = 1900 -24(9) = 1900 -216 = 1684 . . . . billion barrels
__
<h3>C)</h3>
The reserve will be 0 when ...
0 = 1900 -24t
24t = 1900 . . . . . add 24t
t ≈ 79.17 . . . . divide by 24
Reserves will be gone in about 79.17 years.
Answer:
£ 170 .
Step by step explanation :
Given that the price of a computer was decreased by 20% to £136. And we need to find the Original price before the decrease. So , let the earlier price be x ,
<u>Decrease in 20 % :- </u>
⇒ Decreased price = 20% of x
⇒ Decreased price = 20/100 × x
⇒ Decreased price = x/5
<u>New price :- </u>
⇒ New price = x - x/5
⇒ New price = 5x - x/5
⇒ New price = 4x/5.
But its given £ 136 , So
⇒ 4x/5 = £ 136
⇒ x = £ 136 * 5/4
⇒ x = £ 170
<h3>
<u>Hence</u><u> </u><u>the</u><u> Original</u><u> price</u><u> </u><u>was</u><u> </u><u>£</u><u> </u><u>1</u><u>7</u><u>0</u><u> </u><u>.</u></h3>
It is true due to the commutative property of multiplication. If all of your operations are multiplication, then the integers can move around and you can still get the same answer.
^This is only true if you meant to type (1.8x3)x2.1=(1.8x2.1)x3
If you meant what you typed, then the equation is false. The left side would be 3 times the value of the right side due to the 3 being on the left side and not the right side while without the 3 the two sides would be equal.
In writing down the opposite value of each number, the comparison Tina wrote incorrectly is: Comparison X
<em><u>Recall:</u></em>
- Opposite values of a number are numbers that are of the same distance from point zero on a number line.
- For example, if a is a number, the opposite of a is -a. Or if -3 is a number, the opposite of -3 is 3 because -3 and 3 are both 3 units away from point zero on a number line.
Thus, Tina's comparison is given in the diagram attached below.
The comparison labelled X is incorrect because -(-9) = 9. Opposite of 9 is -9.
Therefore, in writing down the opposite value of each number, the comparison Tina wrote incorrectly is: Comparison X
Learn more about opposite value of a number on:
brainly.com/question/12427791
