2 years ago

Can someone explain this?

Mathematics

1 answer:

kati45 [8]2 years ago

4 0

Answer:

see the attachment!

i hope this can help you.

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Help please Algebra 2 B

NNADVOKAT [17]

$- 2(3) + 5 \\ - 6 + 5 = - 1 \\ \\ - 2(4) + 5 \\ - 8 + 5 = - 3 \\ \\ - 2(5) + 5 \\ - 10 + 5 = - 5 \\ \\ - 2(6) + 5 \\ - 12 + 5 = - 7 \\ \\ - 1 + ( - 3) + ( - 5) + ( - 7) \\ = - 16$

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4 years ago

AB=4, AE=6, ED=9, Find AC=

LiRa [457]

Ab/ac = ae/ad = be/cd

4/ac = 6/15

6 ac = 60
ac = 60/6 = 10

ac = 10

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3 years ago

The curves r1(t) = 4t, t2, t3 and r2(t) = sin(t), sin(5t), 2t intersect at the origin. find their angle of intersection, θ, corr

san4es73 [151]

First get the tangent vectors by differentiating r1 and r2
$r_1 '(t) = (4,2t,3t^2) \\ \\ r_2'(t) = (cos (t), 5 cos(5t), 2)$
Evaluate at t=0
$r_1' = (4,0,0) \\ \\ r_2' = (1,5,2)$

Use identity for angle between 2 vectors:
$u*v = |u| |v| cos \theta$

Evaluate dot product and unit vectors:
$u*v = (4,0,0)*(1,5,2) = 4 \\ \\ |u| = \sqrt{4^2 +0^2+0^2} = 4 \\ \\ |v| = \sqrt{1^2 + 5^2+2^2} = \sqrt{30}$

Sub into identity and solve for theta:
$4 = 4 \sqrt{30} cos \theta \\ \\ cos\theta = \frac{1}{\sqrt{30}} \\ \\ \theta = 79.48$

Answer:
Angle of intersection is about 79 degrees.

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4 years ago

15x-10x please help please help

Ilya [14]

Answer:

Step-by-step explanation:

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3 years ago

Read 2 more answers

A 20 foot ladder is leaning against the outside of the house while a painter is painting. The ladder makes an angle of 72∘ with

sveta [45]

Cos (72°) = x/20