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slamgirl [31]
3 years ago
13

A bookstore had 80 copies of a magazine. Yesterday,it sold 1/4 of them. Today, it sold 3/5 of what remained. How many copies doe

s the bookstore have left
Mathematics
1 answer:
Nana76 [90]3 years ago
4 0
1/4 of 80 is 20, so they have 60 left aftef yesterday. then sold 3/5 of 60 which is 36. so the book store has 24 left
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The area of a triangular block is 49 square inches. If the base of the triangle is twice the height, how long are the base and t
andrezito [222]
1) Formula: area = height * base / 2

2) Call x the height:

height = x

base = 2x

3) State the equation:

(x)(2x) = 49 in^2

4) Solve the equation:

2x^2 = 49 in^s

x^2 = (49/2) in^2

x = √(49/2) in

x = 7√2 / 2 in = 3.5 √2 in

5) Solution:

height = 3.5 √2 in and base = 7√2 in

6) Verification: area = (7√2 in) (3.5√2 in) = 49 in^2

Answer: height = 3.5√2 in and base = 7√2 in.
5 0
3 years ago
There are 3 consecutive odd integers that sum to -261. what are the integers​
Iteru [2.4K]

-85, -87, -89

Step-by-step explanation:

1. Divide -261 by 3. (Answer is -87)

2. Take the odd integer before it (-85) and the odd integer after it (-89).

4 0
3 years ago
How do i do 3 part a ?
WINSTONCH [101]


In general the binomial expansion is


(a+b)^n = {n \choose 0} a^0 b^n + {n \choose 1} a^1 b^{n-1} + {n \choose 2} a^2 b^{n-2} + ... + {n \choose n} a^n b^0


So in our case, because we want ascending powers of x we'll write,


(-3x + 1)^{11} =  {11 \choose 0} (-3x)^0 1^{11} + {11 \choose 1} (-3x)^{1} 1^{10} + {11 \choose 2} (-3x)^{2} 1^9  + {11 \choose 3 } (-3x)^3 1^8 + ...


We need to calculate the binomial coefficients:


{11 \choose 0}  = 1


{11 \choose 1}  = 11


{11 \choose 2}  = \dfrac{11 \times 10}{2} = 55


{11 \choose 3}  = \dfrac{11 \times 10 \times 9}{3 \times 2} = 165


(-3x+1)^{11} =  1 (-3x)^0 1^{11}  + 11(-3x)^{1} 1^{10}  + 55 (-3x)^2 1^{9}  + 165 (-3x)^3 1^8 + ...


(1-3x)^{11} =  1 -33 x + 495 3x^2 - 4455 x^3+ ...



6 0
3 years ago
Please answer correctly
vekshin1

Theoretical: the result is based on the number of outcomes.

7 0
4 years ago
2 2/8 - 1 7/8 = ?<br>please help me ​
diamong [38]

Answer:

0.375 or 3/8 you welcome

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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