All categories

3 years ago

I need help I try Photomath I didn’t help me .

Mathematics

2 answers:

kaheart [24]3 years ago

4 0

Answer:

8. 8.80

9. 90

Step-by-step explanation:

Question 8: Use the Pythagorean formula

DE² = DF²+EF²

EF² = DE² - DF²

= 16.2² - 13.6²

= 77.48

EF = √77.48 = 8.80 (Answer)

Question 9: Use the Cosine Rule

GI² = GH² +HI² - 2·GH·HI·Cos ∠GHI

= 60² + 42² - 2·60·42·Cos 123

= 3600 +1764 - (-2744.98)

= 8108.98

GI = √8108.98 = 90

bonufazy [111]3 years ago

3 0

Answer:

Step-by-step explanation:

$x=\sqrt{16.2^2-13.6^2} \\=\sqrt{(16.2-13.6)(16.2+13.6)} \\=\sqrt{2.6*29.8} \\=2\sqrt{1.3*14.9} \\=2\sqrt{19.37} \\\approx 8.80$

2*60*42*cos 123=60²+42²-GI²

GI²=3600+1764-5040 cos 123

GI²=5364-5040 cos 123

GI=90.05 (approx)

You might be interested in

Find DY divided by DX by implicit differentiation y=sinxy

amm1812

Answer:

Step-by-step explanation:

$y = sin(xy)\\\frac{d}{dx}y=cos(xy)(\frac{d}{dx}(xy))\\ \frac{d}{dx}y = cos(xy)(y + x*\frac{d}{dx}y)\\ write \: \frac{d}{dx}y \: as\:y'\\y' = cos(xy)(y+xy')\\y' = ycos(xy) + xy'cos(xy) \\y'-xy'cos(xy) = ycos(xy)\\y'(1-xcos(xy)) = ycos(xy)\\\\y' = \frac{ycos(xy)}{1-xcos(xy)}$

6 0

2 years ago

Solve by elimination: -5/7-11/7 x=-y, 2y=7+5x

Veronika [31]

Answer:

x= -3

y= -4

Step-by-step explanation:

If 11/17 and x goes together then this is what I got. Oh plug them in in case its wrong. Good Luck

7 0

2 years ago

Kevin collects rain water in a container shaped like a rectangular prism. After a thunderstorm, he notices the container is two-

scoray [572]

Answer:

Step-by-step explanation:

8 0

2 years ago

1 point) Use Stoke's Theorem to evaluate ∫CF⋅dr∫CF⋅dr where F(x,y,z)=xi+yj+1(x2+y2)kF(x,y,z)=xi+yj+1(x2+y2)k and CC is the bound

Drupady [299]

Answer:

Step-by-step explanation:

Thinking process:

$\int\limits^a_b {cF} \, .dr$

= $\int\limits^a_b {x} \, dx \int\limits^a_b {x} \, dx curlFdS$ by Stoke's Theorem

= $\int\limits^a_b {} \, \int\limits^a_b {} \, < 12y, -12x, 0 > .< z_x,-z_y, 1 > dA\\= \int\limits^a_b {} \, \int\limits^a_b {} \, < 12y, -12x, 0 > .< 2x, 2y, 1 > dA$ since z = $25-x^{2} -y^{2} \\= 0$

3 0

3 years ago

Can the sine rule relationship in trigonometry be used with non right angled triangle?

vaieri [72.5K]

Answer:

Yes

Step-by-step explanation:

The sine rule works on all triangles (not just right-angled triangles) where a side and it's opposit angles are known.

4 0

2 years ago