Help please with math!

7. D. Obtuse

8. D. 5

9. C. 117°

Step-by-step explanation:

Step 1: Define.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Step 2: Solve.

7. The angle presented is an obtuse angle because it is more than 90°, but less than 180°.

-------------------------------------------------------------------------------------------------------------

Step 2 continued: Solve.

8. 140° and 8x° are supplementary angles; this means both angles have a sum of 180°.

The first step to finding 'x' is to subtract 140 from 140 and 180.

(cancels itself out)

Now we are left with:

The last step to solving this is dividing 40 by by the coefficient.

------------------------------------------------------------------------------------------------------------

Step 2 continued: Solve.

9. As I mentioned before, supplementary angles are two angles that have a sum of 180°.

If angle 1 is 63, then angle 2 is..

Angle 2 is 117°.

Here is an attachment to make number 8 easier to understand.

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2

11

step-by-step explanation:

32.50-7.50=25

225/25=11