Skye is buying presents for members of her family. she wants to spend $10 less on her brother than she spends on her sister, and six dollars more than twice the amount she spends on her sister on her mother. if skye has $100 to spend, how much does she intend to spend on her brother?

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.

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12