Answer:
40cm²
Step-by-step explanation:
pretty sure bc there are 8 equal 5 cm² pieces meaning you multiply by 8 for the answer. 5•8=40. I think rofl
The slope would be M= -5/2
Answer:
see explanation
Step-by-step explanation:
Using the double angle identity for sine
sin2x = 2sinxcosx
Consider left side
cos20°cos40°cos80°
= (2sin20°cos20°)cos40°cos80°
= (2sin40°cos40°)cos80°
= (sin80°cos80° )
= (2sin80°cos80° )
= . sin160°
= . sin(180 - 20)°
= . sin20°
= = right side , thus proven
Answer:
Step-by-step explanation:
<u>Use distance formula:</u>
- d = st, where d- distance, s - speed, t - time
a)
<u>Total distance is:</u>
<u>Solve for x:</u>
- 8x = 70 - 10y
- x = (70 - 10y)/8 = (35 - 5y) / 4
<u>Solve for y:</u>
- 10y = 70 - 8x
- y = (70 - 8x) / 10 = (35 - 4x) / 5
b)
<u>Average speed is:</u>
- s(av) = d / t = 70 / (x + y)
c)
<u>The second scenario:</u>
<u>Combine with the first one and solve the system:</u>
<u>Solve by elimination as below:</u>
- 5(10x + 8y) - 4(8x + 10y) = 5*72 - 4*70
- 50x + 40y - 32x - 40y = 360 - 280
- 18x = 80
- x = 40/9
<u>Find y:</u>
- 10*40/9 + 8y = 72
- 8y = 72 - 400/9
- 8y = 248/9
- y = 31/9
A 750,000,000
780,000,000
793,000,000
793,000,000
Or
D 750,000,000
780,000,000