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aleksklad [387]
2 years ago
5

Are the expressions equivalent? 10(x + 2); 10x + 5

Mathematics
1 answer:
lutik1710 [3]2 years ago
7 0

Answer: yes, indeed it is i forgot how it is but it is

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Lisa wants to use her calculator to square a two-digit positive integer, but she accidentally enters the tens digit incorrectly.
Svetradugi [14.3K]

Answer: Correct two digit number= 24

Step-by-step explanation:

Let

x= tens digit (wrong one)

and y= zeroes digit

and z= tens digit (right one)

Now according to the statement,

(10x+y)² -  (10z+y)² = 2340

Simplifying this we get

(x-z)(5x+y+5z)= 117= 1 * 3 * 3 * 13

So it could either be

x-z=1 or x-z=3

If we take the x-z=1

then 5x+y+5z=117

which is not possible as maximum value we can get from this is 99.

This leaves us with x-z=3

so 5x+y+5z= 39

Put x=3+z

We get,

y+10z= 24

Now as y and z both are single digits so the only possible numbers to fit these are y=4 and z=2.

Put z=2 in x=3+z , we get x=5

So the numbers become 10x+y= 54

and 10z+y= 24

Their sum is 54+24=78

Check

54²-24²= 2340 so it is correct.

7 0
3 years ago
Write your answer using integers, proper fractions, and improper fractions in the simplest form
sattari [20]

Answer:

y = 1/4 x - 7/2

Step-by-step explanation:

x - 4y = 14

-4y = -x + 14

y = -x/(-4) - 14/4

y = 1/4 x - 7/2

6 0
2 years ago
Find the area of the disk
Annette [7]

Answer:

36 units

Step-by-step explanation:

If half of one of the 6 sections is three the the other half is equivalent so I multiplied 6×6 and it gave me 36 (units).

6 0
3 years ago
Usando las propiedades de la igualdad resuelve: 13r=117 y explica el procedimiento​
Bas_tet [7]

Answer:

r=9

Step-by-step explanation:

13r=117

r=117/13

r=9

8 0
2 years ago
Pls hurry it is 23 points i need help now Match the equation on the left with the correct estimate on the right. Each equation h
azamat
It looks floppy but you said you need this fast so yeah

6 0
3 years ago
Read 2 more answers
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