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Andru [333]
3 years ago
10

A surveyor needs to determine the height of a tree. She places a mirror on the ground and paces backwards until she sees the top

of the tree reflected in the mirror. She marks where she is standing and then measures the distance from this spot to the mirror which is 1111 feet. She then measures the distance from the mirror to the base of the tree which is 9090 feet. The surveyor's height is 5454 inches from the ground to her eyes. How tall is the tree (in feet) assuming level ground from the surveyor's spot to the mirror and from the mirror to the tree
Mathematics
1 answer:
Arada [10]3 years ago
7 0
She then measures the distance from the mirror to the base of the tree ... backwards until she sees the top of the tree reflected in the mirror.
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Solve x2 - 10x = -21
ipn [44]

Answer:

add 21 to both sides to get everything on one side

x^2 - 10x + 21 = 0

do factorization, guess and check

(x - 7) (x -3) = 0

x =7, and x =3

8 0
3 years ago
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The human resource department at a certain company wants to conduct a survey regarding worker benefits. The department has an al
dezoksy [38]

Answer:

Step-by-step explanation:

Hello!

A systematic sample is a sampling type where, the population units are listed in a certain order, the first unit is randomly chosen from the first k number of units and then the subsequent units are selected in intervals of k. To calculate k, in case you know the population size, you have to divide the population size by the sample size (usually established based on previous information. Remember k is always a whole number.

a) k= pob/n= 4247/40= 106.175 ≅ 106

b) From the 106 individuals you have to randomly select the first unit. Then starting from it the next 39 individuals surveyed will be the +k

Using a random number calculator I've chosen the first individual to be surveyed as number 57 after that you have to add k= 106 to know wich are the next individuals to be sampled:

1) 57                          11) 1117        21) 2177       31) 3237

2) 57 + 106= 163      12) 1223      22) 2283    32) 3343

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7) 693                       17) 1753       27) 2813      37) 3873

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I hope it helps!

3 0
3 years ago
Jackson runs a farm stand that sells bananas and grapes. Each pound of bananas sells for $1 and each pound of grapes sells for $
mars1129 [50]

Jackson sold 27 pounds of bananas and 12 pounds of grapes.

Given that Jackson runs a farm stand that sells bananas and grapes, and each pound of bananas sells for $ 1 and each pound of grapes sells for $ 2.25, and Jackson sold 15 more pounds of bananas than pounds of grapes and made $ 54 altogether, to determine the number of pounds of bananas sold and the number of pounds of grapes sold the following calculation must be performed:

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Therefore, Jackson sold 27 pounds of bananas and 12 pounds of grapes.

Learn more about quantities in brainly.com/question/25823155

3 0
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Lindy puts £ 78 into an account which pays inrerest at a rate of 5% per anum. What will be the simple interest after 6 years .wh
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Answer:

Interest: £23.4

Amount: £101.4

Step-by-step explanation:

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5 0
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Lady_Fox [76]
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<u>Answer:</u>

<u>a- (1,1) (3,4) (9,7)</u>

Hope you could get an idea from here.

Doubt clarification - use comment section.

6 0
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