Answer:
25a2b2+4a2b+6ab2-4ab+7
Step-by-step explanation:
=sum of two polynomials -one addend
=20a2b2-8a2b+6ab2-4ab+2-(-5a2b2+12a2b-5)
=20a2b2-8a2b+6ab2-4ab+2+5a2b2-12a2b+5
=25a2b2+4a2b+6ab2-4ab+7
160, I think. SA=2(lw+lh+wh).
Answer:
Sample mean
Sample variance
Sample proportion
Step-by-step explanation:
Answer:
881.5 meters.
Step-by-step explanation:
The horizontal plane at the level of wai-kin's eyes divide the height of the cliff into two parts. Let the upper part be represented by x and the lower part be represented by y.
The height of the cliff = x + y
Applying the appropriate trigonometry functions.
To determine the value of x;
Tan θ = 
Tan
= 
⇒ x = 490 x Tan 
= 490 x 0.7265
= 355.985
x = 356 meters
To determine the value of y;
Tan θ = 
Tan
= 
⇒ y = 490 x Tan 
= 490 x 1.0724
= 525.476
y = 525.5 meters
Therefore,
The height of the cliff = x + y
= 355.985 + 525.476
= 881.461
The height of the cliff is 881.5 meters.