There are (4^9)^5 ⋅ 4^0 books at the library. What is the total number of books at the library?

1 answer:

8 0

Do (4^9)^5 first, when an exponent is in a parenthesis with another exponent outside, you multiply them which makes 4^45. Then we multiply 4^0 but this time we add the exponent because there’s no parentheses, which gives you 4^45.

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13x = 79 ? Can somebody explain #9 b. PLEASE. Please solve using the system of linear equations by elimination.I would love it i

strojnjashka [21]

8x + 2y = 44
5x + 2y = 35

Since 2y is already common, there is no need for multiplication. Just reverse the signs on the equation.

Like this;

8x + 2y = 44
-5x - 2y = -35

All the additions become subtractions and vice versa.

-2y and +2y get cancelled.

Leaving;

8x = 44
-5x = -35

Now, subtract again.

8x - 5x = 3x

44 - 35 = 9

So;

3x = 9

x = 9 / 3

x = 3

We found 'x' and now we have to find 'y'.

Just substitute.

[8 x 3] + 2y = 44

24 + 2y = 44

2y = 44 - 24

2y = 20

y = 20 / 2

y = 10

Now, we re-check;

[8 x 3] + [2 x 10] = 44

24 + 20 = 44

Explaining the error for #9b is simply doing the whole sum.

Hope this helped! :) I tried my best to explain.

7 0

3 years ago

In a group of 80 children there are 3 times as many boys as girls how many girls are there

insens350 [35]

80=x+3x
80=4x
20=x

There are 20 girls.

7 0

2 years ago

(2.75 x 107) + (1.23 x 108) simplify

Thepotemich [5.8K]

Answer:

427.09

Step-by-step explanation: