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ankoles [38]
3 years ago
9

Help with this question please!

Mathematics
1 answer:
Zepler [3.9K]3 years ago
3 0
Gotta subtract the triangle from the semi circle

Triangle: 1/2 base • height
= 1/2 (6) • 3
= 9

Then find the semi circle
(pi r^2)/2
= (3.14 • 3^2)/2
= 14.13

14.13 - 9 = 5.13 mm^2
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Steel loading ramps are used to load a lawn mower onto a truck bed 37.5 inches above the ground. If the ramp make a 30° angle wi
scoray [572]

Answer:

6.25 feet.

Step-by-step explanation:

Please find the attachment.

Let L be the length of the ramp in feet.  

We have been given that steel loading ramps are used to load a lawn mower onto a truck bed 37.5 inches above the ground. The ramp make a 30° angle with the ground.

We can see from our attachment that ramp and truck bed forms a right triangle with ground. The truck bed is opposite side and length of ramp is hypotenuse of our given angle.

Since we know that Sine relates the opposite and hypotenuse of a right triangle, so we will use Sine to solve for L.

\text{Sine}=\frac{\text{Opposite}}{\text{Hypotenuse}}

Upon substituting our given values in above formula we will get,

\text{Sin(30)}=\frac{37.5}{L}

L=\frac{37.5}{\text{Sin(30)}}

L=\frac{37.5}{0.5}

L=75

Therefore, the length of the ramp is 75 inches.

Let us convert the length of ramp in feet.

1 feet = 12 inches.

\text{75 inches}=\frac{75\text{ inches}}{\frac{12\text{ inches}}{\text{feet}}}

\text{75 inches}=\frac{75\text{ inches}}{12}\times \frac{\text{ feet}}{\text{inches}}

\text{75 inches}=\frac{75}{12}\times\text{ feet}

\text{75 inches}=6.25\text{ feet}

Therefore, the length of the ramp is 6.25 feet.

7 0
4 years ago
Read 2 more answers
What is the closed linear form for this sequence given a1 = -15 and an + 1 = an - 8?
Elza [17]

Answer:

<h3>a_n=-8n-7 is the closed linear form of the given sequence.</h3>

Step-by-step explanation:

Given that a_1=-15 and a_{n+1}=a_n-8

<h3>To find the closed linear form for this given sequence :</h3>

So each of the successive term of the given sequence is decreases by 8

Therefore the common difference is -8

The given sequence is a arithmetic sequence.

The general form is a_n=a_1+(n-1)d

Substitute a_1=-15 and d=-8 in a_n=a_1+(n-1)d we get

a_n=-15+(n-1)(-8)

=-15-8n+8

a_n=-8n-7

<h3>Therefore a_n=-8n-7 is the closed linear form of the given sequence.</h3>

7 0
4 years ago
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What's 1.6 as a fraction??
WARRIOR [948]
Answer is this: 1 6/10 
8 0
3 years ago
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The ratio of the number of dolls Jacky had to the number of dolls Peter had was 5 : 2 but, after Jacky gave 15 dolls to Peter, t
tester [92]

Answer:

35 [$]

Step-by-step explanation:

1) if Peter's sum is p and Jacky's is j, then the ratio 5:2 in the condition can be written j/p=5/2;

2) the phrase 'after Jacky gave 15 dolls to Peter, they have an equal number of dolls' can be written as j-15=p;

3) using the two above it is possible to make up the system of two equations:

\left \{ {{\frac{j}{p} =5/2} \atop {j-15=p}} \right. \ = > \ \left \{ {{j=2.5p} \atop {j-15=p}} \right. \ = > \ \left \{ {{j=25} \atop {p=10}} \right.

4) finally, the have together 10+25=35 doll-s.

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A scuba diver at a depth of -12ft(12 ft below sea level),dives down to a coral reef that is 3.5 times the divers original depth.
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-42ft below sea level
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