The regular price of a calculator is 15.40 it goes on sale for 30% what is the amount of savings

30% of $15.40 is  ( 0.3 x $15.40) = $4.62 .

From the way the question is written, we don't know if
that  $4.62  is the discount or the sale price.

Is the calculator on sale for 30% ?
Or is it on sale for 30% OFF ?

If 30% is the discount, then the amount of saving is  $4.62 .

If 30% is the sale price, then the amount of saving is ($15.40 - $4.62)

                                                                           =        $10.78 .
 

The density of the cube is 40

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.