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3 years ago

Please help, I'm so bad at math

Mathematics

1 answer:

balu736 [363]3 years ago

4 0

Answer:

y = 110 and x = -15

Step-by-step explanation:

y = 110 because whenever x = 0 then y is the number in relation with x.

So it would be

y = -15x + 110

I used my calculator.

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A 3-lb force acting in the direction of the vector (3,-1) moves an object just over 9 ft from point (0,5) to (6,-2). Find the wo

kodGreya [7K]

Answer: The Work done to move the object is $=23.15 \text { foot pounds }$

Step-by-step explanation:

Given;

Force F=3 $l b s$

Vectors of F= (3,-1)

Moves object to a distance=9 $f t s$

Let A and B be the displacements Vectors

A= (0,-5)

B= (6,-2)

To Find:

Work done in foot-pounds

Solution:

Work done $W=F \times D$

Direction of force vector= (3,-1) (i, j)

=3i-j

Unit of force vector $=\sqrt{3^{2}+\left(-1^{2}\right)}$

$=\sqrt{9+1}$

Force vector=(Force/Unit Vector)Direction of force vectors

F= $3 / \sqrt{10} \times(3 i-j)$

Direction of motion vector= (B-A)

= (6,-2)-(0,-5) x i,j)

=(6-0),(-2-5) x (i, j)

=(6,-7) x (i, j)

=6i-7j

Unit of motion vector $=\sqrt{6^{2}+\left(-7^{2}\right)}$

$=\sqrt{36+49}$

$=\sqrt{85}$

Motion Vector= (Distance moved by the object/Unit motion vector) × (Direction of motion vectors)

$D=9 / \sqrt{85} \times(6 i-7 j)$

Workdone $W=F \times D$

$= [3/ \sqrt{10} \times (3i-j)] \times [9/ \sqrt{85} \times (6i-7j)]$

$= [3/ \sqrt{10} \times 9/ \sqrt{85}] \times [(3i-j) \times(6i-7j)]$

$= [3/3.1623 \times 9/9.2195] \times [(3\times6) + ((-1) \times (-7))]$

$= [0.94867 \times 0.97619] \times [18+7]$

$=23.15 \text { foot pounds }$

Result:

Work done to move an object $=23.15 \text { foot pounds }$

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3 years ago

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Answer:the answer is 5/9

Step-by-step explanation:

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MaRussiya [10]

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Ludmilka [50]

Answer:

The father is 40 years old, and his daughter is 10 years old.

Step-by-step explanation:

Given that a father is four times the age of his daughter, and after 5 years, he would be 3 times of daughter's age, then further after 5 years, to determine how many times he would be of his daughter's age, the following calculation must be done:

F = 4D

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Step-by-step explanation:

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