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Aleksandr [31]
3 years ago
12

David is visiting his aunt for the Thanksgiving weekend. He drove 60% of the trip at 40 mph and the rest at ‘x’ mph. The average

speed for the entire trip is 50 mph. What is x? A. 60 mph B. 70 mph C. 75 mph D. 80 mph E. 90 mph F. 100 mph
Mathematics
2 answers:
Brut [27]3 years ago
4 0

Answer:

D. 80 mph

Step-by-step explanation:

d- distance

  • d/50= 0.6d/40+0.4d/x
  • 1/50= 0.3/20+0.4/x
  • 0.4/x= 0.02- 0.015
  • x= 0.4/0.005
  • x= 80 mph
malfutka [58]3 years ago
4 0
The answer is D.80 mph !!!
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2 years ago
an item is regularly sold at $40. kala bought it at a discount of 35% off the regular price. how much did kala pay
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To solve this problem, we must first find the discount amount, and then subtract this amount from the total price of the item.

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To solve, we just multiply these two numbers together, which gives us 14.

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5 0
3 years ago
xialoli was estimating the difference between two positive numbers x and y (where x&gt;y). First she rounded x up by a small amo
AleksandrR [38]

Remark

This is an excellent question. Estimation is a powerful skill to have. People should always shop using estimates. Try it to see what happens.

x = 11.7 which rounds up to which we will call x1 and that is 12

y = 6.03 which round down to 6 which we will call y1 and that is 6

Now x - y = 5.67

If you do the rounded subtraction x1 - y1 = 12 - 6 = 6

The estimate is not zero. D is not correct.

There is enough information E is not the answer.

B is wrong, her estimate is larger than x - y

C is wrong the two subtractions are not equal.

A is correct and always will be no matter what numbers are chosen

A <<<< Answer

5 0
3 years ago
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