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artcher [175]
3 years ago
11

Please help me I have 2 questions.

Mathematics
1 answer:
Maru [420]3 years ago
5 0
For the first one, with Bob and James, it takes Bob 1 roof for every 16 hours per roof ( 1/10)
James can finish 1 every 16 hours, ( 1/16)
1/10 + 1/16=1/t
8/80 + 5/80=1t
13/80=1t
now you would cross multiply
13(t)=1(80)
13t=80
t=6.15
It would take them 6.15 hours to finish!

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Helpppppppppp me pleaseeeee
Vlad1618 [11]

Answer:

A = 16   13unit^2 + 9unit^2 = 5 √10 = 15.8 = 16

Step-by-step explanation:

For Pythagoras we square route

= x^2 = 13^13 +  (one of the closer squares for x elimination)

x= 169 + 81        169 + 100       169 + 49   169+64     169 + 121

x = 250    or         269       or     218        or  233     or  290

x= 5√10 or 15.8    or   √269 269   or    √218 2.8     or  √233 or 2.33 ( or  √290 = ( √48+2) or 2.9

6 0
3 years ago
Distance between parallel lines y=3x+10 and y=3x-20
Alecsey [184]

1. Take an arbitrary point that lies on the first line y=3x+10. Let x=0, then y=10 and point has coordinates (0,10).


2. Use formula d=\dfrac{|Ax_0+By_0+C|}{\sqrt{A^2+B^2}} to find the distance from point (x_0,y_0) to the line Ax+By+C=0.


The second line has equation y=3x-20, that is 3x-y-20=0. By the previous formula the distance from the point (0,10) to the line 3x-y-20=0 is:

d=\dfrac{|3\cdot 0-10-20|}{\sqrt{3^2+(-1)^2}}=\dfrac{30}{\sqrt{10}}=3\sqrt{10}.


3. Since lines y=3x+10 and y=3x-20 are parallel, then the distance between these lines are the same as the distance from an arbitrary point from the first line to the second line.


Answer: d=3\sqrt{10}.

4 0
3 years ago
What is the place value digit of the digit 7 in 74,310,892
ycow [4]

Answer:

tens of millions

Step-by-step explanation:

TM M HT TT T H T U

7 4 3 1 0 8 9 2

7 0
2 years ago
Find the slope of the line passing through the pointg (7, 1) and (7, - 2).<br> slope:
Artist 52 [7]

Answer: No slope / undefined

Step-by-step explanation:

Concept:

Here, we need to know the idea of a slope.

The slope is the measure of the steepness of a line.

The basic formula of slope is [Rise / Run] which is basically [Y] value (vertical) over [X] value (horizontal)

If you are still confused, please refer to the attachment below for the full formula.

Solve:

(7 ,1)

(7, -2)

Slope = (1 - (-2)) / (7-7)

Slope = (3) / 0

Slope = Undefined

Indeed, it is a vertical line. By definition, a vertical line has no slope.

Hope this helps!! :)

Please let me know if you have any questions or need further explanations

5 0
3 years ago
Peter buried a treasure chest on a remote island and is.making a map so he can find it later. One of the key landmarks in the ar
PIT_PIT [208]
Where’s the rest of the question?
5 0
3 years ago
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