Pythagora: 20^2=(4x)^2+(3x^2)
400=16x^2+9x^2
x^2=400/25
x^2=16
x=4
no number can have a positive and a negative at the same time. a negative number has a negative sign and a positive number has a plus sign.
Answer:
I Think it is A
Step-by-step explanation:
It is a because 9×7=63
x/20 = 21/14 (similar proportions)
x/20 = 3/2 (simplify by canceling out a factor of 7)
x = 30
The standard form: ax + by = c
and your equation is: -2x + 3y = - 5 (Yes this is written in standard form)
