Multiply: (5t – 4)(4t + 5)
what is the product?
20t2 + 9t – 20
20t2 + 18t – 19
20t2 + 25t – 36
20t2 + 41t – 20

The product of the expression is:

We have to find the product of two algebraic  expressions which are given in terms of variable t  as:

We know that the product of two linear function will result in a quadratic equation i.e. a polynomial of degree 2.

We find the product as follows:

Hence, the product is:

40 minutes

step-by-step explanation:

add the time and multiply by 2

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)