Simplify:

square root of 3 times square root of 21

square root of 24

square root of 63

3 square root of 7

none of the above

Answer

3 square root of 7

Explanation

square root of 3 times square root of 21

√3 × √21 = √(3×21)

                  = √63

                  = √(9×7)

                  = √9 × √7

                    = 3 × √7

                   = 3√7

The answer is 3 square root of 7

a

step-by-step explanation:

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form