The answer is B since he bought 4 in all it is x+y =4 . x=dvd y= blue ray discs .
so 2x + 5y =11
2x since dvds are $2
5y since blue ray discs are $5
11 since that’s the total
Answer:
SA= 84 cm^2
Step-by-step explanation:
So first locate all the surfaces
we got 5 sides in total
Now calculate each one
Lets start with the 2 triangles
so formula for area of triangl is 1/2(b*h)
So in this case it’s 6
Now there are 2 identical triangles
So Times the 6 by 2
You’ll get 12
Thats 2 sides
Now for the side with the rectangle of 5cm and 6cm
Area of rectangle is 5*6=30
That would onay be 1 side
Now for the bottom of the prisim which is the side with 4cm and 6cm
Same rectangle so multiply
4*6=24
Thats another side down
The last side is on the left with the back not visible. The two dimensions are 6 and 3
Now multiply 6*3
18
Now add up your total
18+24+12+30=84
So 84 cm^2 OR 84 square centimeters
Answer: 0.8202
Step-by-step explanation:
Probability an adult was never in a museum = probability of success = p = 15% = 0.15
To find probability that 2 or fewer of the 10 samples selected were never in a museum is given by:
P(X=2) or P(X=1) or P(X=0).
Where
P(X=r) = nCr * p^r * q^n-r
and n=10, p =0.15, q=0.85
When r = 2
P(X=2) = 10C2 * 0.15² * 0.85^8 = 0.2759
When r = 1
P(X=1) = 10C1 * 0.15 * 0.85^9 = 0.3474
When r = 0
P(X=0)= 10C0 * 0.15^0 * 0.85^10 = 0.1969
Hence probability of having 2 or fewer adults who never visited the museum = 0.1969 + 0.3474+ 0.2759 = 0.8202
Y/9=44/54
9(Y/9)=9(44/54)
Y=7 1/3 or 22/3
Answer:
Given 7b²-21b-273=7, the solutions are x1 = 8 and x2 = -5.
Step-by-step explanation:
Given 7b²-21b-273=7, first you need to equal zero. So
7b²-21b-273-7=0 ⇒ 7b²-21b-280 = 0
The secon step is to find the solutions applying Bhaskara´s formula x = (-b ± √(b²-4×a×c))/2×a
Where a=7, b= -21 and c= -280
After you identified each term, you have to replace it on the formula so....
x = (21 ± √(21² - 4×7×(-280)))/2×7 ⇒ x = (21 ± √(441 + 7840))/14 ⇒ x = (21 ± √8281)/14
Then you will obtain two values for x, called x1 = 8 and x2=-5.
