Which ordered pairs are solutions to the equation? y = 2x + 5

A.
(5, 10) and (2, 9)

B.
(5, 15) and (9, 2)

C.
(15, 5) and (2, 9)

D.
(5, 15) and (2, 9)

Answers

Answer 1

Answer: D.
y=2x+5
Sub in one pair (5,15)
15=2(5)+5
15=10+5
15=15 [Correct]
AND
9=2(2)+5
9=4+5
9=9 [Correct]

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The area given is 726 in². To get the measurement of each edge, we simply find the square root of 726 in²

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The scatter plot below shows the number of prom tickets sold over a period of 7 days. The line of best fit drawn on the plot shown is used to predict the number of tickets sold on a certain day. Use the two points shown on the line of best fit to calculate its slope to the nearest tenth.

Answers

Answer:

The slope is $4.2\ (tickets)/(day)$

Step-by-step explanation:

The picture of the question in the attached figure

Let

x ----> the number of days

y ---> the number of tickets sold

we have the points

(1,30) and (7,55)

The formula to calculate the slope between two points is equal to

$m=(y2-y1)/(x2-x1)$

substitute the given values in the formula

$m=(55-30)/(7-1)$

$m=(25)/(6)$

$m=4.2\ (tickets)/(day)$

$12.50 marked up by 140%

Answers

Answer: 17.5

Step-by-step explanation: 12.5*140%

An elevator moving down passes its neighbor, an elevator moving up. Their speed relative to one another is 8 m/s. What is the velocity of each elevator relative to someone standing on the first floor? Assume that the elevators are traveling at the same speed, and that the upward direction is positive.

Answers

If they appear to be travelling at 8 m/s as viewed by one of them, then someone on ground floor sees what is actually happening. One is going up at 4 m/s and the other is going down at 4 m/s.

The direction matters. The answer is C.

LiftA= u m/s ( upwards)
LiftB= -u m/s(downward)

Velocity A relative to B= V lift A- V lift B=8m/s
u-(-u)=8
u=4m/s
Lift A= 4 m/sec
Lift B= -4m/sec
For someone standing on first floor will be stationary W.r.t to the lift.
V lift A relative to Man= V liftA - V man= 4m/s

V lift B relative to Man= V lift B- V Man= -4 m/s

What is -4+(-2)=

I have no clue what i’m doing

Answers

Answer:

-6

Step-by-step explanation:

its just negative four plus negative two

they only put it in parentheses because they cant have both signs right next to each other

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