How do I answer question #4?

The answer to your question is below

Step-by-step explanation:

4.-

4a.                     72

                       _x 9

                         638

4b. The error this student is doing is that he multiplies the first number but he must add the decenes of this result to the result of the multiplication of the second number and he is not doing that.

4c.- I told him the correct way to solve multiplications.

   a) Multiply the first number and only write the units.

   b) If the are decenes add then to the units of the result of the multiplication of the second number.

Example                                

                                72            9 x 2 = 18

                               x9             Just write the 8

                                  8

                                72

                               x 9

                               648           9 x 7 = 63 + 1 from the previous operation

                                                          = 64

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation:

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc