Answer:
y = -5x + 30, 20th number is -70.
Step-by-step explanation:
All you have to do is look at how much the equation is growing by and what the starting number is for the equation. to find the 20th figure, you plug 20 in for x and get -70.
Answer:
25
Step-by-step explanation:
180-45=135 and 180-135=45
360 is the sum of all angles so:
360-105-135-45=75
3x=75
x=25
Answer:
7z
Step-by-step explanation:
subtracting a negative is like adding

Answer:
k = 
Step-by-step explanation:
Using the rules of logarithms
log x - log y = log(
)
log a = log b ⇒ a = b
Given
logk - log(k - 2) = log25, then
log (
) = log25, thus
= 25 ( multiply both sides by (k - 2)
25(k - 2) = k
25k - 50 = k ( subtract k from both sides )
24k - 50 = 0 ( add 50 to both sides )
24k = 50 ( divide both sides by 24 )
k =
= 