The sum of 7-1 and 7-2 will be a rational number because sum of rational numbers is a rational numbers.
A rational number is a number which can be written in p/q form where q≠0.
We know that when two rational numbers is added then the sum is also a rational number. And when two rational numbers are subtracted then the difference is also a rational number.
So in the given question, lets study the term differently that is,
i) 7 - 1 is a rational number because their difference is equal to 6 and it can be written in p/q form which is 6/1.
ii) 7 – 2 is also a rational number as their difference will be 5 which is a rational and can be written in p/q form which is 5/1.
So when these two rational numbers are added their sum will also be a rational number which is 11.
Learn more about rational numbers here : brainly.com/question/12088221
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Answer:
840 ways.
Step-by-step explanation:
The order is important, which means that the permutations formula is used to solve this question.
Permutations formula:
The number of possible permutations of x elements from a set of n elements is given by the following formula:
In this question:
4 items from a set of 7, so:
840 ways.
Answer: Accommodation
Step-by-step explanation:
Accommodation is the adjustment of the optics of the eye to keep an object in focus on the retina as its distance from the eye varies.
The exponential function is :
y=ab^x
We have two points:
(1, 7.5)
(3, 16.875)
First point:
(1 , 7.5)
x=1
y=7.5
y=ab^x
7.5=ab¹
Second point:
(3 , 16.875)
x=3
y=16.875
y=ab^x
16.875=ab³
Then, always is true that.
7.5 / 16.875 = (ab) / (ab³)
7.5(ab³)=16.875(ab)
7.5ab³ / a
b²=16.875
7.5b²=16.875
b=⁺₋√(16.875 / 7.5)
b=⁺₋1.5
if b=-1.5 ⇒ 7.5=a(-1.5) ⇒a=-5
y=-5*(-1.5)^x
y=5(1.5^x)
if b=1.5 ⇒ 7.5=a(1.5) ⇒ a=5
y=5*(1.5^x)
Answer; y=5*1.5^x