Answer:
16/25
Step-by-step explanation:
To find the probability that she gets both questions right, multiply the probabilities together:
4/5 x 4/5
= 16/25
So, the probability that she answers both correctly is 16/25
Answer:
4. z = -1
5. x = 3.5 or 7/2
Step-by-step explanation:
4.
-4z + 8 = 7z +14 + 5
-4z + 8 = 7z + 19
8 = 11z + 19
-11 = 11z
-1 = z
5.
6-x/5 = 6-3x+6/3
6-x/5 = 12-3x/3
18 - 3x = 60-15x
-3x = 42 - 15x
12x = 42
x = 3.5 or 7/2
<h3>Given</h3>
<h3>Find</h3>
<h3>Solution</h3>
It can be convenient to rewrite f(x) as a square, then do the substitution. That way, the algebra is simplified a little bit.
... f(x) = (x +1)²
... f((2a-3)/5) = ((2a-3)/5 +1)² = ((2a -3 +5)/5)²
... = (2/5(a+1))²
... f((2a-3)/5) = (4/25)(a² +2a +1)