Answer:
Step-by-step explanation:
If congruent the sides are equal
15x-9=7x+11
8x=20
x=20/8=2.5
 
        
             
        
        
        
Answer:
m∠A=90°, m∠B=60°, m∠C=30°
Step-by-step explanation:
step 1
Verify if the triangle ABC is a right triangle
Applying the Pythagoras theorem

 ----> is true
 ----> is true
therefore
Is a right triangle
m∠A=90°
Find the measure of angle C
sin(C)=AB/BC
substitute
sin(C)=6/12=1/2
so
m∠C=30°
Find the measure of angle B
we know that
m∠C+m∠B=90°------> by complementary angles
so
m∠B=90°-30°=60°
 
        
             
        
        
        
B; you can graph the function on a graphic calculator or use algebra find each of the desired aspects
        
                    
             
        
        
        
Answer:
question 1: 24
question 2: (1/45)*(1/5)=(1/9)
Step-by-step explanation: