Which of the following functions has a maximum y value of 4? y = 4cosx y = cos4x y = cosx + 4 y = cos(x + 4)

y = 4cosx

Step-by-step explanation:

Since we have cosx lying between -1 and 1, we have

y =4cosx lying between 4(-1) and 4(1)

i.e. maximum value is 4.

II option is incorrect because cos4x has maximum value only as 1.

III option is also incorrect because cos(x)+4 has maximum as 1+4=5

IV option is also incorrect because cos(x+4) has maximum as 1

As a result we have out of 4 options given only I option satisfies the condition that the function has a maximum value of 4.

step-by-step explanation:

. your answer will contain x - and y -terms. (1 point) x ( ¿¿ 2 − 7 ) 2 +( y 2 − 9 ) 2 √ ¿ 12. what is the distance from the directrix (the crocodile river) to the point ( x , y )? write this equation. your answer will contain a y -term.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6