Help Please, first one to answer gets BRAINLIEST!

D . 300

Step-by-step explanation:

First find the volume of the rectangular prism with the dimension .

To find the volume, multiply the length by the width by height.

The length is 1 1/4  turn it into an improper  fraction.

1 1/4 = 5/4

Now multiply the three fractions

* =    

Now notice that the that in the second statement it says the side length of the cube is 1/8. So we need to find the volume of a single cube multiply the length by the with by the height. All sides of a cube are equal so you can just cube the side length to find the volume.

V= s^3

V= (1/8)^2

v = 1/512

Now since we know that the volume of a single cube is 1/512  will will divide the volume of the rectangle by the volume of cubes to find out how many cubes are needed to fill the rectangular prism.

=  38400/128 = 300

In this case 300 unit cubes are needed to fill the rectangular prism.

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

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)