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tatiyna
3 years ago
13

Need help with maths ASAP

Mathematics
1 answer:
givi [52]3 years ago
8 0

Answer:

a = 7

b = 3

Step-by-step explanation:

So you can come up with 2 equations.

a(9 + b) = 84

ab = 21

On the first equation, divide by 9 + b on both sides.

a=\frac{84}{9+b}

n the second equation, divide by b on both sides.

a=\frac{21}{b}

Now you can set them equal and solve for b.

\frac{84}{9+b}=\frac{21}{b}

Cross multiply:

84b = 189 + 21b

63b = 189

b = 3

a = 7

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Which of the following statements is not true
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Read 2 more answers
What is the volume of a certain cube? (1) The sum of the lengths of the edges of the cube is 36. (2) The surface area of the cub
german

Answer:

(1) The sum of the lengths of the edges of the cube is 36.

A cube has 12 equal edges. Sum = 36. Length of each edge = 36/12 = 3

Volume = 3*3*3 = 27

(2) The surface area of the cube is 54.

A cube has 6 identical faces. Area of each face = s^2 (s is the length of the side)

6s^2 = 54

s = 3

Volume = 3*3*3 = 27

Step-by-step explanation:

All you need to uniquely define a cube is any one measurement - length of a side/edge, area of a surface, volume etc. If you have any one of them, you can uniquely determine the others. So each statement alone is sufficient here.

To show how,

(1) The sum of the lengths of the edges of the cube is 36.

A cube has 12 equal edges. Sum = 36. Length of each edge = 36/12 = 3

Volume = 3*3*3 = 27

(2) The surface area of the cube is 54.

A cube has 6 identical faces. Area of each face = s^2 (s is the length of the side)

6s^2 = 54

s = 3

Volume = 3*3*3 = 27

8 0
3 years ago
Tbh i can probably get it but I don't want to do it rn
DIA [1.3K]

Answers:

  • A) 1/2
  • B) 1/6
  • C) 1/3

==================================

Explanation:

  • A) There are 3 copies of '1' out of 6 slices total. So we get 3/6 = 1/2
  • B) There's only one copy of '3' out of 6 total, which means 1/6 is the probability of landing on '3'.
  • C) There are 2 places we want to land out of 6 total. The probability is 2/6 = 1/3
5 0
2 years ago
Read 2 more answers
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