Which ones apply? and this answer is an emergency

Step-by-step explanation:

The given equations are Ax + By = C and Dx + Ey = F

If one multiple of equation 1 replaces it, then it is nothing but the same equation itself, hence first option can be selected.

If the sum of equation 1 and 2 will replace equation 1 then, it will show some additional data in the changed equation. Hence, second option can also be selected.

If we replaced the equation 1 with (A + D)x + By = C then the system of equations will take us to a different solution. Hence, the third option can not be selected.

Fourth option is same as the third option, here the difference is just the another variable is chosen. It can not be selected.

Fifth option can be selected as it changes the equation 1 by multiplying the given data of 1 and 2 with some value and adding them.

42%

step-by-step explanation:

we know,

total people = 60

total males = 25

percentage of males

= 25/60 × 100

= 25/6 × 10

= 25/3 × 5

= 125 / 3

= 41.

rounding of = 42%

happy to

pls mark as brainliest

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -