3 years ago

A librarian arranged some books on the shelf using the Dewey decimal system. Choose the group of book numbers that

Mathematics

1 answer:

vovangra [49]3 years ago

6 0

Answer:

The answer is C), 834, 834.19, 834.2, 834.29

Step-by-step explanation:

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Ethan opens up a new savings account. The account has a 3.5% compound interest per annum. Ethan invests £2,000 into the account

Margarita [4]

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3 years ago

The sum of the digits of a two-digit number is 12. the number formed by interchanging the digits is 54 more than the original nu

Grace [21]

The number is xy
x+y=12

10y+x=54+10x+y

so

x+y=12
minus x both sides
y=12-x
sub that for y

10(12-x)+x=54+10x+(12-x)
120-10x+x=54+10x+12-x
120-9x=66+9x
add 9x both sides
120=66+18x
minus 66 both sides
54=18x
divide both sides by 18
3=x

sub back
y=12-x
y=12-3
y=9

the number is 39

4 0

3 years ago

Please help, thank you so much! I'll give brainliest to the correct answer!

ratelena [41]

Answer:

Step-by-step explanation:

This is because the other ones were going to be spent on something else, but then they were spent on magazines or flowers.

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3 years ago

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