20 POINTS! HELP!
Choose the expression that represents a linear expression.

A. −17x^4 − 18x^3 + 19x^2 − 20x + 21
B. 18x^3 + 19x^2 − 20x + 21
C. 23x^2 + 24x − 25
D. 4x + 4

D is correct

Step-by-step explanation:

A linear expression contains no higher power exponents than 1

Only D satisfies this as 4x+4 is the same as 4x^1+4

Hope this helped!

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

step-by-step explanation:

if you meant, "on the way from (3, 2) to (3, 14):

x does not change; y increases by 12.

ensure that you have copied down this problem correctly.   .