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3241004551 [841]
3 years ago
9

2-4 savas quiz 8th grade

Mathematics
1 answer:
Vikki [24]3 years ago
4 0

Answer: -2

Step-by-step explanation:

2-4=-2

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A plane traveled 1463 miles to Moscow and back. The trip there was with the wind. It took 11 hours. The trip back was into the w
Studentka2010 [4]

The speed of plane is 105 miles per hour and speed of wind is 28 miles per hour.

Step-by-step explanation:

Given,

The distance traveled by plane = 1463 miles

The trip with the wind took 11 hours.

The trip took 19 hours against the wind.

Let,

s be the speed of plane and w be the speed of wind.

Therefore;

Speed with the wind = s+w

Speed into the wind = s-w

We know that;

Distance = Speed * Time

Therefore;

Equation for trip taken with wind.

1463 = 11(s+w)

Dividing both sides by 11

\frac{1463}{11}=\frac{11(s+w)}{11}\\133=s+w\\s+w=133\ \ \ Eqn\ 1

Equation for trip taken into the wind

1463 = 19(s-w)

Dividing both sides by 19

\frac{1463}{19}=\frac{19(s-w)}{19}\\77=s-w\\s-w=77 \ \ \ Eqn\ 2

Adding Eqn 1 and 2

(s+w)+(s-w)=133+77\\s+w+s-w=210\\2s=210

Dividing both sides by 2

\frac{2s}{2}=\frac{210}{2}\\s=105

Putting s=105 in Eqn 1

105+w=133\\w=133-105\\w=28

The speed of plane is 105 miles per hour and speed of wind is 28 miles per hour.

3 0
3 years ago
A day care worker found 28 children absent one day during an epidemic of chicken pox. If this was 35% of the total number of chi
creativ13 [48]

Answer:

80 children attend this day care,

Step-by-step explanation:

Let x represent the number of children that attend this day care center. The day care worker found 28 children absent one day during an epidemic of chicken pox.

If this was 35% of the total number of children attending the day care center, it means that the number of children absent one day during the epidemic of chicken pox can be expressed as

35/100 × x = 0..35×x = 0.35x

Therefore,

0.35x = 28

x = 28/0.35= 80

7 0
3 years ago
a farmer has enough food to feed 28 animals for 5 days how long would the food last ifthere are 7 more animals
Dvinal [7]
Oof it is all of the above ok -.-
6 0
3 years ago
Which statements can be used to justify the fact that two right angles are supplementary? Check all that apply.
mamaluj [8]
The answer is a and c
5 0
3 years ago
Read 2 more answers
Find the slope and the y-intercept of the graph of the linear equation.
pantera1 [17]

Answer:

Yintecept is 0

Step-by-step explanation:

because it's y= Mx+b

but this one is y = mx

6 0
3 years ago
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