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3 years ago

Timothy stated that the sum of 0.9 + (-9/10) was 18/20.

Mathematics

2 answers:

cupoosta [38]3 years ago

7 0

The sum is 0 he added instead of subtracting, you can’t add .9 and /.9 it cancels out

Evgesh-ka [11]3 years ago

3 0

Answer:

18/10

Step-by-step explanation:

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In ΔXYZ, ∠Y=90° and ∠X=73°. ∠ZWY=80° and XW=80. Find the length of ZY to the nearest 100th.

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Answer:

Solution given:

Y=90°

∠X=73°.

∠ZWY=80°

and XW=80.

ZY=?

We know that

In right angled triangle ∆ XYZ

Tan 73= $\frac{p}{h}$

3.27= $\frac{yz}{xy}$

3.27×[xy]=yz

xw+wy= $\frac{yz}{3.27}$

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In right angled triangle WYZ

Tan 80= $\frac{yz}{wy}$

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wy= $\frac{yz}{5.67}$

yz=5.67×wy............................................(2)

Equating equation 1&2

$\frac{yz}{5.67}$ = $\frac{yz}{3.27}$ -80

$\frac{yz}{3.27}$ - $\frac{yz}{5.67}$ =80

5.67yz-3.27yz=80*5.67*3.27

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yz= $\frac{1483.272}{2.4}$

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