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4 years ago

A 17 metre tall tree casts a shadow that is 20 metres long. What angle, to the nearest degree, does the sun make with the ground

Mathematics

2 answers:

trapecia [35]4 years ago

6 0

I agree with the answer above :) .... good work

svlad2 [7]4 years ago

4 0

Answer:

About 32º

Step-by-step explanation:

since 17 m is one leg, and 20m is the hypotenuse, we can write:

cos (x) = 17/20

x = cos-1(17/20)

x is about 32º

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Find the exact value of the expression if θ = 30°. Do not use a calculator.

Sidana [21]

From my knowledge, I know that cos(30) = ((2)^(1/2))/2, therefore 9cos(30) = 9((2)^(1/2))/2

6 0

3 years ago

Al and Barb start their new jobs on the same day. Al's schedule is 3 work-days followed by 1 rest-day. Barb's schedule is 7 work

Murljashka [212]

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6 0

4 years ago

Please help me with this problem

My name is Ann [436]

Answer:

$6A- 8B = \left[\begin{array}{ccc}56&50&-14\\-126&92&62\\-78&26&2\end{array}\right]$

Option A is correct.

Step-by-step explanation:

$A=\left[\begin{array}{ccc}-4&-1&-9\\-9&6&9\\-1&-1&3\end{array}\right] \\B=\left[\begin{array}{ccc}-10&-7&-5\\9&-7&-1\\9&-4&2\end{array}\right]$

We need to find 6A - 8B

Multiply matrix A with 6 and matrix B with 8 and then subtract 6A - 8B

$6A=\left[\begin{array}{ccc}-24&-6&-54\\-54&36&54\\-6&-6&18\end{array}\right] \\8B=\left[\begin{array}{ccc}-80&-56&-40\\72&-56&-8\\72&-32&16\end{array}\right]\\6A - 8B =\left[\begin{array}{ccc}-24-(-80)&-6-(-56)&-54-(-40)\\-54-(72)&36-(-56)&54-(-8)\\-6-(72)&-6-(-32)&18-(16)\end{array}\right] \\6A - 8B =\left[\begin{array}{ccc}-24+80&-6+56&-54+40\\-54-72&36+56&54+8\\-6-72&-6+32&18-16\end{array}\right] \\6A- 8B = \left[\begin{array}{ccc}56&50&-14\\-126&92&62\\-78&26&2\end{array}\right]$

So, $6A- 8B = \left[\begin{array}{ccc}56&50&-14\\-126&92&62\\-78&26&2\end{array}\right]$

Option A is correct.

3 0

3 years ago

(x^2+8x+16)-1-16<br><br> what is the vertex form

Colt1911 [192]

Answer:

Use photo math, it will explain it all in different forms

4 0

3 years ago

An angle measures 6º less than the measure of its complementary angle. What is the

vesna_86 [32]

Answer:

The measure of each angle is:

48° y 42°

Step-by-step explanation:

Complemenary angles sum 90°

then:

a + b = 90°

a = b - 6

∴

(b-6) + b = 90

2b - 6 = 90

2b = 90+6

2b = 96

b = 96/2

b = 48°

a = b-6

a = 48 - 6

a = 42°

Check:

42° + 48° = 90°

8 0

3 years ago