Answer:
should be 15...
Step-by-step explanation:
Answer:
f(d)=400(0.794)^d
Step-by-step explanation:
The correct answer to this question is this one: "D. 11.474"
your calculator probably doesn't do "secant". But sec is 1/cos
so do cos(85) (in degree mode, not radian mode)
then "invert it": 1 / ANS or x^-1 if you have that key
or type
1/cos(85 degrees)= <span>11.4737</span>
9/20
the numbers that would satisfy this are 15,16,17,18,19,20, 1,2,3
so there are 9/20