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Schach [20]
3 years ago
11

A bag contains yellow marbles and blue marbles, 23 in total. The number of yellow marbles is 7 less than 2 times the number of b

lue marbles. How many yellow marbles are there?
Mathematics
1 answer:
erica [24]3 years ago
3 0

Answer:

8

Step-by-step explanation:

yellow marbles=2b-7

blue marbles=2b

2b+2b-7=23

4b=23+7

4b=30

b=30/4

b=7.5

yellow marbles=2b- 7

2 x 7.5 -7

15 - 7

=8

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a truck traveled 60 km per hour the first hour, 45 miles per hour as the next 30 minutes and 50 km per hour in next 45 minutes w
-BARSIC- [3]
Answer: 
134 kilometers or 83 miles.

Explanation: 
First make all the units equivalent, so 
60 km/h = 60 km/h or 37.28 m/h
45 m/h = 72.42 km/h or 45 m/h
50 km/h = 50 km/h or 31.07 
So in one hour the car has gone 60 km or 37.28 m because they travel at 60km/h, which means they get that far in that amount of time. 
In half an hour they get half of 45 miles, because 45 m/h means they get 45 miles in 60 minutes, so in 30 minutes, or half and hour, they are getting half of 45 = 22.5 miles or 36.21 kilometers. 
In 45 minutes they are getting 75% of 50 km because 45 minutes is 75% of an hour. So 75% of 50 is 37.5 km or 23.3 miles. 

Add this all together and get:
Kilometers:
60 + 36.21 + 37.5 = 133.71 km
Miles:
37.28 + 22.5 + 23.3 = 83.08 m 
133.71 km = 83.08 So it checks out.
This is approximately 134 km or 83 miles.
4 0
3 years ago
Quan uses 19 over 2 cups of flour recipe. after baking, one has 17 over 2 cups of flour left over. Find the number of cups of fl
zmey [24]

Answer: 8.5 cups of flour.

Step-by-step explanation: So he first has 19/2 cups of flour, 19/2 cups of flour is the recipe, which is 9.5 cups of flour. He finishes the recipe with 17/2 cups left, which is 8.5 cups of flour.

4 0
4 years ago
Explain how to tell weather an event is as likely as not
Degger [83]
I think the answer may be that an event is as likely as not to happen when the probability of the event happening is 50%, and the probability of the event not happening is 50%. Like a coin toss, the chance you will flip a "heads" is 1/2 or 50%, and the chance that you WON'T flip a heads is also 1/2 or 50%
5 0
3 years ago
-3(x + 6) =<br> Simplify expression
omeli [17]

Answer:

3x +18

Step-by-step explanation:

use distributive property.

5 0
4 years ago
Read 2 more answers
2 triangles are shown. The first triangle has side lengths 35, 20, and 20. The second triangle has side lengths x, 44, 44.
Ad libitum [116K]

The value of x is 77 cm which will make the triangles similar by SSS similarity theorem

Given length of the three sides of one triangle are  35 , 20 and 20

and length of the three sides of another triangle are  x, 44,44

We need to find the values of x by using SSS Similarity theorem

We know that triangles are are similar by side - side - side similarity creation and hence the sides are in the same ratio

As both the triangles are isosceles triangles

Therefore ,

x/35 = 44/20=44/20 (Using ratio)

Solving the equation we get

x=44*35/20

x= 77

Hence the value of x is 77cm

Learn more about similarity of triangles here brainly.com/question/14285697

#SPJ10

8 0
2 years ago
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