<u><em>Seventy-seven is a composite number. </em></u>
Because you had to divide by eleven or seven. Then you can multiply by seven or eleven its equal to seventy-seven.




Final answer: 
Hope this helps!
And thank you for posting your question at here on brainly, and have a great day.
-Charlie
 
        
             
        
        
        
That is not a trapezoid, it is a general quadrilateral.  All 2-dimensional, 4-sided figures have an internal angle sum of 360 (triangles are 180).  So if you assume angles P and Q are right, they are each equal to 90 degrees, for a total of 180.
Subtract: 360 - 180 = 180.  We know that S + R must equal 180.  If you subtract 180 - 65, you get 115, which is obtuse (greater than 90 degrees).  This matches the drawing as the unknown angle is clearly greater than 90.  So the answer is 115 degrees.
        
             
        
        
        
Answer:
A linear formula for S as a function of D is S=17D+1534
Step-by-step explanation:
We are supposed to find a linear formula for S as a function of D.
Equation of line : y = mx+c
We are given that At the surface, the speed of sound is 1534 meters per second. 
c = 1534
We are given that for each increase in depth by 1 km, the speed increases by 17 m/s
So, Slope = m = 17 
Substitute the values in equation
y=17x+1534
x denotes depth
y denotes speed 
We are given that Use D for depth and S for the speed of sound 
So, S=17D+1534
Hence a linear formula for S as a function of D is S=17D+1534
 
        
             
        
        
        
Answer:
10x² - 14xy -6y
Step-by-step explanation:
5x(2x-y)-3y(2+3x)
10x²-5xy-6y-9xy
10x² - 14xy - 6y
 
        
             
        
        
        
Take away 0.20 of the amount.