Which value of x is the figure a rhombus?

x = 20.5
x = 2.6
x = 15.19
x = 7

The value of x is 7 .

Step-by-step explanation:

By using the property of rhombus .

The diagonals of the rhombus intersect each other at 90° .

Thus

Apply angle sum property of a triangle .

∠(8x + 7) °+ ∠(3x + 6)° +∠ 90 ° = ∠180 °

Open the bracket

8x + 7 + 3x + 6 + 90 = 180

11x + 13 = 180 - 90

11x + 13 = 90

11x = 90 - 13

11x = 77

x = 7

Therefore the value of x is 7 .

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.