1) De la suma de x 2 + 5 con 2x – 6 restar la suma de x - 4 con x + 6 2) Restar la suma de 3x 2 – y 2 con -11xy + 9y 2 – 14 de la suma de x 2 - 3xy – y 2 con 9y 2 – 8xy + 19x 2
3) Multiplicar a 3 – 3a 2 b + 4ab 2 por a 2 b – 2ab 2 -10b 3
4) Dividir x 6 + 6x 3 – 2x 5 – 7x 2 – 4x + 6 entre x 4 – 3x 2 + 2

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

-2 is the right

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

x = 17

step-by-step explanation:

1st step: isolate x.

24 - 3x = -27

-24         -24

-3x   =   -51

2nd step: divide.

-3x     =   -51

  3             3

  x       =     17

hope this