Best answer gets !
which of the following best describes the expression 2a + 3b + 4c + 5d?

the product of four sums; there are four terms
the product of four sums; there are eight terms
the sum of four products; there are four terms
the sum of four products; there are eight terms

In the rectangle below ac=30 units what is de

One positive number is 9 more than twice another. if their product is 95, find the numbers

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.