Answer:
Ответ - 15.
Step-by-step explanation:
Путешественники добирались до города на разных транспортах. Чтобы найти общее время, пройденное этими людьми, если 15. Добавьте 3 к 7, а затем прибавьте к нему 5.
52\10= $5.20 so that is the right answer
Ok here's what I make of this: you're in calculus and you're working with functions and their first derivatives, which are the position function and the velocity function, respectively. You need to figure out what the functions are so you can solve the problem. But the acceleration due to gravity goes into the velocity function as -32t; in the position function, the antiderivative of velocity, it goes in as -16t^2. The position function is s(t) = -16t^2 + 48t + 400. When you solve that for t, what you get is the time the rock hits the ground. When you find that t value, sub it into the velocity equation to find the velocity at that time the rock hits the ground. Solving for t (using the quadratic equation) you get a t value of 6.720153. The velocity equation, the first derivative, is v(t) = -32t + 48. Subbing the t value of 6.720153 in you get that the velocity is -167.045. Negative is correct here as well because it was positive going up and now it's coming down.
Assuming the .75x4 is .75 times x times for and not .75 times four...
Firstly, know you want x on its own.
So I’d start by adding 8 to both sides. This cancels out the -8:
.75x *4 - 8 = -12
+8 +8
= .75x * 4 = -4
Now divide by 4, both sides.
.75x * 4 = -4
———————
4
=.75x = -1
Finally, divide both sides by .75:
.75x = -1
—————
.75
= x = -1.33 (33 repeating) OR -4/3
But if you meant .75x^4 - 8 = -12 then here’s the answer.
First you add 8 to both sides, so:
75x^4 - 8 = -12
+8 +8
= .75x^4 = -4
Now divide both sides by .75:
.75x^4 = -4
——————
.75
= x^4 = -5.3333 OR -16/3
Now’s the harder part. We need to get rid of ^4 from x. Which means taking the root (both sides)...
An easier way to say this, and how I prefer to set it up, is + or - (-16/3)^(1/4)
You have the + or 1 part because the square root of something is always able to be positive or negative— as an easy example, 2*2=4 and -2*-2=4, so root of 4 could be -2 or 2. Anyways for this problem there aren’t any real solutions.
If your teacher is expecting you to use i in order to get the answers (for this last part, assuming they wanted .75x^4 and not .75x*4) then I can explain in the comments but it’s definitely harder than what I’ve shown here.
