I really really need help Idont understand it

angle A and angle B both equal 150 degrees

Step-by-step explanation:

angle A and angle B are congruent

so you take both equations and equal them together

8x-10=3x+90

   +10      +10

8x=3x+100

-3x -3x

5x=100

/5     /5

x=20

Now that you have that, you plug it into the equations. You only plug it into one because they are both equal

Angle A = 8(20)-10

8*20= 160

160-10= 150

Hope this helps :D

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a