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Vika [28.1K]
3 years ago
12

A bookstore had 60 copies of a magazine. Yesterday, it sold 1/4 of them. Today, it sold 2/5 of what remained. How many copies do

es the bookstore have left?
Mathematics
1 answer:
KatRina [158]3 years ago
8 0
There would be 29 books left
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A pedestal for a statue is made with 405 cubic feet of concrete. a rectangular prism with a height of 9 feet. what is the area o
enyata [817]

45 square feet is the area of the base of the pedestal.

what is rectangular prism?

  • A rectangular prism is a 3D figure with 6 rectangular faces.
  • To find the volume of a rectangular prism, multiply its 3 dimensions: length x width x height. The volume is expressed in cubic units.

we know that

The volume of the pedestal (rectangular prism) is given by the formula

   V =   B × h

where

B is the area of the rectangular base of pedestal

V = 405 ft³

h = 9 ft

put the given values in the formula and solve for B

405 = B × 9

B = 405/9

B = 45 ft²

Therefore, 45 square feet is the area of the base of the pedestal.

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A dog walker earns $10 plus $3 per dog. What equation represents this model?
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10+3x Or 3x+10.
This is because he gets 10 dollars add it to the 3 he gets per dog. The per dog is X as you don’t know how many dogs he gets
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2 years ago
1) Carefully follow the steps to find the solution to the three equation system.
rjkz [21]

Step-by-step explanation:

a. we simply subtract 3. from 2.

x + 2y + z = 15

- -3x + y + z = 2

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4x + y 0 = 13

b. we multiply 3. by 3 and then subtract from 1.

2x - 4y + 3z = -7

- -9x + 3y + 3z = 6

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11x - 7y 0 = -13

c. we multiply the result of a. by 7, and then simply add a. and b., because the y terms have different signs already.

28x + 7y = 91

+ 11x - 7y = -13

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39x = 78

x = 2

d. we use this x = 2 in the result of a.

4×2 + y = 13

8 + y = 13

y = 5

e. using x = 2 and y = 5 in 2.

2 + 2×5 + z = 15

2 + 10 + z = 15

12 + z = 15

z = 3

the solution is therefore (2, 5, 3).

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Answer:

Researchers found that mild allergic reactions may help prevent severe reactions to the same allergin in the future.

Step-by-step explanation:

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Arrange the following measurements in order from smallest to largest
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