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Mars2501 [29]
2 years ago
6

HELP!!! -1/2(b-6)=5

Mathematics
1 answer:
notsponge [240]2 years ago
5 0

Answer:

<h2>b=-4</h2>

Step-by-step explanation:

<h3>-1/2b+3=5</h3><h3>-1/2=5-3</h3><h3> -1/2b=2×-2</h3><h2> b=-4</h2>
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1. Prove or give a counterexample for the following statements: a) If ff: AA → BB is an injective function and bb ∈ BB, then |ff
Fantom [35]

Answer:

a) False. A = {1}, B = {1,2} f: A ⇒ B, f(1) = 1

b) True

c) True

d) B = {1}, A = N, f: N ⇒ {1}, f(x) = 1

Step-by-step explanation:

a) lets use A = {1}, B = {1,2} f: A ⇒ B, f(1) = 1. Here f is injective but 2 is an element of b and |f−¹({b})| = 0., not 1. This statement is False.

b) This is True. If  A were finite, then it can only be bijective with another finite set with equal cardinal, therefore, B should be finite (and with equal cardinal). If A were not finite but countable, then there should exist a bijection g: N ⇒ A, where N is the set of natural numbers. Note that f o g : N ⇒ B is a bijection because it is composition of bijections. This, B should be countable. This statement is True.

c) This is true, if f were surjective, then for every element of B there should exist an element a in A such that f(a) = b. This means that  f−¹({b}) has positive cardinal for each element b from B. since f⁻¹(b) ∩ f⁻¹(b') = ∅ for different elements b and b' (because an element of A cant return two different values with f). Therefore, each element of B can be assigned to a subset of A (f⁻¹(b)), with cardinal at least 1, this means that |B| ≤ |A|, and as a consequence, B is finite.

b) This is false, B = {1} is finite, A = N is infinite, however if f: N ⇒ {1}, f(x) = 1 for any natural number x, then f is surjective despite A not being finite.

4 0
3 years ago
The first class had a kids in it, the second had b kids in it, and the third class had c kids in it. Kids from all three classes
kramer
(a+b+c)/2. this is your answer. if it had the numbers i would solve it fully, but it only has variables.
3 0
3 years ago
Read 2 more answers
The number 360 is increased by 25%. The result is then decreased by 50%. What is the final number?
Vladimir [108]
So if 360 is increased by 25%, you would end up with 450 (360 x 1.25), than if the result, 450 is decreased by 50% ( 450 x .50 = 225) (450 - 225 = 225) you would end up with 225.
3 0
3 years ago
Pls help me I’m trying my best but it’s too hard
bekas [8.4K]

Answer:

Step-by-step explanation:

3 0
2 years ago
PLEASE HELP! WILL MARK BRAINLIEST ANSWER!
lubasha [3.4K]

Answer:

5

Step-by-step explanation:

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3 years ago
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