The temperature inside a certain industrial machine at time t seconds after startup, for 0 < t < 10, is given by h(t) = 42t + 1 – 4t + 2 degrees celsius. how many seconds after startup is the temperature inside the machine equal to 128 degrees celsius?

Step-by-step explanation:

We are given the temperature inside the machine from startup until 10 seconds later, the formula is:

We want to know at what time t the temperature inside the machine will be equal to 128 °C.

So we set:

Now, we rearrange the equation to keep terms with t on the left hand side and terms without t on the right hand side

and we simplify:

now it's easy to solve for t:

And thus we arrive to the solution.

step-by-step explanation:

there are 36 inches in a yard

25 : 36 = 0.69 yards (you can round to 0.70)