Answer:
(b) 1:9
(c) 1:8
Step-by-step explanation:
(b) x*y : kx*ky, so 1:k² with k=3 is 1:9
(c) Assuming the rectangles get a z dimension, the volumes would have a ratio of xyz : xkykzk = xyz : xyzk³ = 1 : k³. With k=2 that is 1:8. But the z was never introduced so this is a bit inconclusive.
First we need to isolate the variable so we add 15 to both sides which is
w/4=43 then we need to multiply by 4 to both sides so its 4w=172
then divide by 4 which is 43 so the answer is w=43
By Sine Rule
a/sinA = b/sinB = c/sinC
Given a = 3, b = 4, A = 76°
<span>43sin76° = 4/sinB
</span>
==> sinB = 1.195380945
<span>
But sine function is only defined in the range [-1, 1], so there's no solution.
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Do either 190-39=151 or 190-151=39