Answer:
(x+2)^{2} +5(x+2)-6=0
Let
u=(x+2)
Substitute in the expression
(u)^{2} +5(u)-6=0
therefore
the answer is
(u)^{2} +5(u)-6=0 is equivalent to (x+2)^{2} +5(x+2)-6=0
brainly.com/question/6501456
Answer:
area of the daises part of the garden = 1/3 x 30 1/2
10 1/6 square feet
Step-by-step explanation:
area of the daises part of the garden = area of garden x 1/3
= 1/3 x 30 1/2
Convert the mixed fraction to an improper fraction
to convert to improper fraction, take the following steps :
1. Multiply the whole number by the denominator
2. Add the numerator to the answer gotten in the previous step
3. divide the number gotten in the previous step by the denominator
= 1/3 x 61/2 = 61/6
convert to mixed fraction
10 1/6
Answer:
Mean = 78.2
Standard deviation = 5.8
Step-by-step explanation:
Mathematically z-score;
= (x-mean)/SD
From the question;
12% of test scores were above 85
Thus;
P( x > 85) = 12%
P(x > 85) = 0.12
Now let’s get the z-score that has a probability of 0.12
This can be obtained from the standard normal distribution table and it is = 1.175
Thus;
1.175 = (85 - mean)/SD
let’s call the mean a and the SD b
1.175 = (85-a)/b
1.175b = 85 - a
a = 85 - 1.175b ••••••••(i)
Secondly 8% of scores were below 70
Let’s find the z-score corresponding to this proportion;
We use the standard normal distribution table as usual;
P( x < 70) = 0.08
z-score = -1.405
Thus;
-1.405 =( 70-a)/b
-1.405b = 70-a
a = 70 + 1.405b ••••••(ii)
Equate the two a
70 + 1.405b = 85 - 1.175b
85 -70 = 1.405b + 1.175b
15 = 2.58b
b = 15/2.58
b = 5.81
a = 70 + 1.405b
a = 70 + 1.405(5.81)
a = 78.16
So mean = 78.2 and Standard deviation is 5.8
1. (3x+1)(8x-2) 24x^2+8x-6x-2 24x^2+2x-2
2. (5n-5)(4n+8) 20n^2-20n+40n-40 20n^2+20n-40
3. (7x-2)(x^2-6x-5) 7x^3-2x^2-42x^2+12x-35x+10 7x^3-44x^2-23x+10
4. (5b-2)(3b^2-b+2) 15b^3-5b^2+10b-6b^2+2b-4 15b^3-11b^2+12b-4
I have the last two in a little bit.
Answer:
Its A and C trust me
Step-by-step explanation:
I got it right on edg 2021 sorry if i'm late
