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Dimas [21]
3 years ago
6

Help me please on math

Mathematics
2 answers:
V125BC [204]3 years ago
6 0
What do you need help with
dybincka [34]3 years ago
4 0
I can not see the question.
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The sum of the dibits of a two digit number is 15. The number obtained by interchanging its digits exceeds the given number by 9
QveST [7]

Answer:

  78

Step-by-step explanation:

Interchanging the digits of a 2-digit number changes the value by a multiple of 9. The multiple is the difference between the digits of the number.

So, we have two digits that add to 15, and have a difference of 9/9 = 1. Since you're familiar with your addition facts, you know that the two digits are 7 and 8. Since the number we're looking for is the smallest of the numbers you can make with those digits, ...

  the original number is 78.

_____

More formally, let t and o represent the tens and ones digits of the original number.

  t + o = 15 . . . . . . the sum of digits is 15

  (10o +t) - (10t +o) = 9 . . . . swapping digits increases the value by 9

The latter equation simplifies to ...

  9o -9t = 9 . . . . collect terms

  o - t = 1 . . . . . . divide by 9 . . . (note the difference of digits is 9/9=1)

Adding this to the first equation gives ...

  (t +o) +(o -t) = (15) +(1)

  2o = 16

  o = 8

  t = o -1 = 7

The tens digit is 7 and the ones digit is 8: 78.

3 0
2 years ago
How many kilograms of pasta will each person get if 4 people share 1/2 of a kilogram of pasta equally?
Elenna [48]

Answer:

1/8 kg

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
The formula for the volume of a cube is V = s3.
satela [25.4K]

Question

The formula for the volume of a cube is V = s3.

What is the side length of a cube with a volume of 27 M^{3}


Answer:

<h2>3m</h2>

Step-by-step explanation:

V=l³

you use the inverse formula

l = ∛27

l = 3m


4 0
3 years ago
Claire is going to an amusement park. The price of admission into the park is $30, and once she is inside the park, she will hav
nydimaria [60]

Answer:

1. $66

2. 30 + 4r

Step-by-step explanation:

Let

Price of admission into the park=$30

Price of every ride in the park=$4

Number of rides =x

Total cost of going to the park= 30+4x

1. How much money would Claire have to pay in total if she goes on 9 rides

Total cost of going to the park= 30+4x

When x=9

=30+4x

= 30 + 4(9)

=30 + 36

=$66

2. How much would she have to pay if she goes on r rides?

When x=r

Total cost of going to the park= 30+4x

= 30 + 4(r)

=30 + 4r

4 0
3 years ago
Read 2 more answers
What is 7.55×8 please show work
iVinArrow [24]
Is this Long multiplication?
7 0
3 years ago
Read 2 more answers
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