The trapezoid shown has bases of lengths a units and b units and height 7 units, where a and b are positive integers and a < b. If the trapezoid
has area 49 units2, how many possible values are there for a?

image for option 4

step-by-step explanation:

i just know the internet

1) the property is   ixi = a ⇔x = a   o x = -a

4(x-5)+3= 15⇒4x-20+3 = 15⇒4x-17= 15⇒4x = 15+17⇒4x = 32⇒x =32/4= 8

4(x-5) +3= -15⇒4x-20 +3 = -15⇒4x-17= -15⇒4x =-15+17⇒4x = 2⇒x =2/4= 1/2

the values are x =8 and x = 0,5