Since 16 and 25 are perfect squares you can factor the first part.
4^2-5^2(b+3)^2
=(4-5(b+3))(4+5(b+3))
=(4-5b-15)(4+5b+15)
=(-11-5b)(19+5b)
Which can be expanded if necessary,
= -209+150b-25b^2
Answer:
x = 1 ⇔ y = -2.4
x = 2 ⇔ y = -1.8
x = 3 ⇔ y = -1.2
x = 4 ⇔ y = -0.6
Step-by-step explanation:
→ Rearrange to make y the subject
→ Multiply everything by -1
→ Divide everything by 5
⇒ Substitute x = 1, 2, 3 and 4
Answer:
3
Step-by-step explanation:
Answer:
correct option is B. 199
Step-by-step explanation:
given data
pick observers = 2
make = 100 aesthetic judgments
to find out
degrees of freedom
solution
we know that the degrees of freedom is express here as
degrees of freedom = 2 n - 1 ................................1
here we know n is 100 given
so put here value we get
degrees of freedom = 2 n - 1
degrees of freedom = 2×100 - 1
degrees of freedom = 199
so correct option is B. 199
495 is 99% of 500 to check: 500×.99=495 (.99 is the decimal version of 99%). ANSWER: 99%