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nekit [7.7K]
3 years ago
12

Annette drives her car 105 miles and has a mean of a certain speed. if the mean speed had been 4mph more, she could have travele

d 119 miles in the same length of time. what was her mean speed?
Mathematics
1 answer:
ollegr [7]3 years ago
3 0
Let the mean speed be x mi/hr
Time taken to travel will be:
distance/ speed
thus:
105/x=119/(x+4)
solving for x we get:
105(x+4)=119x
105x+420=119x
119x-105x=420
x=30 mi/hr
Thus the mean speed is 30 mi/hr
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Least common multiple of 70, 60, and 50
goldenfox [79]
70 = 7 x 2 x 5
60 = 2² x 3 x 5
50 =  2 x 5²
 
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Answer: LCM = 210
3 0
3 years ago
If M is between S and T, SM = 9x - 8,<br> MT = 2x + 3, and ST = 72. Find x.
kolezko [41]

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7

Step-by-step explanation:

Since, M is between S and T.

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3 0
3 years ago
8(-2x+1)=30-(-4+3x)<br><br> solve for x
Fittoniya [83]

Answer:

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Step-by-step explanation:

8 (-2x + 1) = 30 - (-4 + 3x)   Distribute

-16x + 8 = 30 + 4 - 3x  Combine like terms

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4 0
2 years ago
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Which mixed number is equivalent to 11/4
puteri [66]
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5 0
3 years ago
Samantha sends her son, Barry, to a preschool center on certain days. The cost of preschool is $45 per day along with a fixed mo
Travka [436]

Answer: Option D

D. 880 = 45d + 70; 18\ days

Step-by-step explanation:

We know that the cost of preschool is $ 45 per day plus a monthly fee of $ 70.

We also know that a total of $ 880 was paid last month

To write an equation that represents this situation, let us call "d" the number of days that Barry attends school

So the cost was:

45d + 70 = 880

Now we solve the equation for the variable d

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d= 18\ days

Therefore answer is the option D

8 0
3 years ago
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