Carl wants to find the product 30×5/6. Which of the following best explains how he can find the product mentally? He knows that 30÷5 is 6. He then multiplies 6 by 6 to get 36.

He knows that 30×6/6 is 30. He then subtracts 1 from 30 to get 29.

He knows that 3×6=18. He then adds 18 and 5 to get 23.

He knows that 30×1/6 is 5. He then multiplies 5 by 5 to get 25.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

20days louise can read300 pg

step-by-step explanation:

1 day 15 pg 300: 15= 20

x day 300 pg

system of linear equation

step-by-step explanation:

as given in the data

a= 20 , b= -12

let us suppose that it is a straight line equation

now we know the formula for the system of linear equation

b= ma + c )

here m is slope of a straight line which is equal to formula

m=   (ii)

and here c is a constant

now putting the value of a and b in equation (ii)

m=

m=

putting the value of a,b and m in equation (i) gives us

-12 = + c

-12=-12 + c

adding 12 to both sides

-12 +12 = -12 +12 +c

0 =c

or c=0

as the value of the constant is zero which gives us that it is a linear equation and this order pair satisfies the system of linear equations.