What is the value of this expression when a = 4, b= -5, and c = -7? a + 2bc/3a

Either 37/6 or 6.2

Step-by-step explanation:

Follow PEMDAS (parenthesis, exponents, multiplication, division, addition, subtraction) where you always start with whatever is first in PEMDAS, in this instance, it's parenthesis or multiplication.

4+2(-5)(-7)/ 3(4)

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.