<span>a. direct variation
A relationship between two variables in which one is a constant multiple of the other. </span>
7x is 49 7x7 take away the x
3.32=5
------- ----
X. 100
So 5x=335
X=66.4
So $66.40

<h3><u>Given :-</u></h3>
- Here, we have given one quadrilateral that is quadrilateral ABCD
- We also have given the angles of quadrilateral that is ( 6x + 5)° , ( 9x - 10)° , 80° and a right angle
<h3><u>To </u><u>Find </u><u>:</u><u>-</u></h3>
Here, we have to find the value of x
<h3><u>Let's </u><u>Begin </u><u>:</u><u>-</u><u> </u></h3>
We have given quadrilateral ABCD here , whose angles are as follows
- Angle A = ( 6x + 5)°
- Angle B = ( 9x - 10)°
- Angle C = 80°
- Angle D = A right angled triangle
[ The measure of right angled triangle is 90° ]
<u>We </u><u>know </u><u>that</u><u>, </u>
- Sum of the angles of quadrilateral is equal to 360°
<u>That </u><u>is </u>

<u>Subsitute </u><u>the </u><u>required </u><u>values </u>









Hence, The value of x is 13 .

Measure of Angle A




Measure of Angle D




<u>Now</u><u>, </u><u> </u><u>we </u><u>know </u><u>that</u><u>, </u>
- Sum of angles of triangles is equal to 360°
<u>That </u><u>is</u><u>, </u>





Hence, Proved.
300+10= 6×35 +10×10 explanation 6×35=210 and then 10×10=100 =210+100=310