Question

Please actually help as soon as possible thanks

Answer 1

Answer:

the angle is marked with a cone so it's a right angle

10x+21+13x=90

23x=69

x=3

13x=39

10x+21

=30+21

51

Step-by-step explanation:

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Answer 2

Answer:

that's very easy see,

• the sum of angles is 90degree
• then 13x+(10x+21)=90
• solve it then x=3
• then angle DEH = 13x=13×3= 39
• and angle HEF = (10x+21)= 10×3+21 =51

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