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zalisa [80]
2 years ago
14

1. Expand 7(3x-4y)

Mathematics
1 answer:
Lesechka [4]2 years ago
3 0

9514 1404 393

Answer:

  1. 21x -28y
  2. 30 minutes

Step-by-step explanation:

1. The distributive property tells you the factor outside parentheses multiplies each of the term inside parentheses.

  7(3x -4y) = 7·3x -7·4y = 21x -28y

__

2. Time, speed, and distance are related by ...

  time = distance/speed

  time = (20 mi)/(40 mi/h) = 1/2 h = 30 minutes

The drive takes 30 minutes.

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A building casts a shadow that is 420 meters long. At the same time, a person who is 2 meters tall casts a shadow that is 24 met
sweet-ann [11.9K]

Answer: <u><em>The building is 35 meters tall.</em></u>

Step-by-step explanation:

<em>420 </em><u><em>divided by </em></u><em>24 is 17.5   </em>

<em>17.5 </em><u><em>x </em></u><em>2 is 35 </em>

<em>(im multiplying by two because it says that a person who is 2 meters tall casts a shadow that is 24 meters long. ***)</em>

<em />

8 0
2 years ago
The salary at Beth’s company is $32,000 for someone with no experience and increases by $2700 per year of experience. Write a ru
AlekseyPX

Answer:

In general, the salary S in terms of years of experience Y is S = 2700Y + 3200

Step-by-step explanation:

we start at 32000 without experience.

as the experience goes up, the wage increases 2700 per year so we can multiply 2700 by the years of experience to find the increase of salary. To find the salary of a certain employee with a certain amount of experience, plug the years of experience in for Y and solve.

for Y=0

S= 2700(0) + 3200 = 0 + 3200 = 0

for Y=2

S= 2700(2) + 3200 = 5400 + 3200 = 8600

for Y=5

S= 2700(5) + 3200 = 13500 + 3200 = 16700

for Y=7

S=2700(7) + 3200 = 2700(5) + 2700(2) + 3200 = 5400 + 13500 + 3200 = 22100

5 0
3 years ago
four students spent 12 on school lunch.at this rate find the amount 10 students would spend on the same school lunch
zloy xaker [14]

Step 1: Set up the proportion

4/12 = 10/x

Step 2: Cross multiply to get

120 = 4x

Step 3: Divide all by 4 to get

30 = x

Answer: So in total, 10 students would spend $30 on lunch!



4 0
3 years ago
The effect of wearing different types of running shoes on the time it takes to complete a race is being studied in experiment. w
lana [24]

Answer:

A. Weather conditions

Step-by-step explanation:

4 0
3 years ago
What is the total cost of a $2,099 couch including the 6.5% sales tax?​
fomenos

Answer:

$2422

Step-by-step explanation:

2099/6.5=322.923076923 (were rounding that to 323)

so 2099+323=2422

8 0
3 years ago
Read 2 more answers
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