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wolverine [178]
3 years ago
14

Sample QnA to Preliminary Exam

Mathematics
1 answer:
Black_prince [1.1K]3 years ago
3 0

Answer:

Bro the work is already completed..

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Sandra normally takes 2 hours to drive from her house to her grandparents' house driving her usual speed. However, on one partic
Rudiy27

Answer:

Her usual driving speed is 38 miles per hour.

Step-by-step explanation:

We know that:

s = \frac{d}{t}

In which s is the speed, in miles per hour, d is the distance, in miles, and t is the time, in hours.

We have that:

At speed s, she takes two hours to drive. So

s = \frac{d}{2}

d = 2s

However, on one particular trip, after 40% of the drive, she had to reduce her speed by 30 miles per hour, driving at this slower speed for the rest of the trip. This particular trip took her 228 minutes.

228 minutes is 3.8 hours. So

0.4s + 0.6(s - 30) = \frac{d}{3.8}

So

3.8(0.4s + 0.6s - 18) = d

3.8s - 68.4 = 2s

1.8s = 68.4

s = 38

Her usual driving speed is 38 miles per hour.

3 0
3 years ago
Which number is not in scientific notation?
Hitman42 [59]

Answer:

A 9 ⋅ 1019

B 7.8 ⋅ 106

C 1.45 ⋅ 10−7

D 0.33 ⋅ 10−15

Step-by-step explanation:

A 9 ⋅ 1019

B 7.8 ⋅ 106

C 1.45 ⋅ 10−7

D 0.33 ⋅ 10−15

6 0
3 years ago
A tractor trailer weighs 80,000 pounds. Two tractor trailers come upon a bridge with a sign saying it can only handle 100 tons.
NikAS [45]
Two tractor trailers would weigh 160,000 pounds, which is equal to 80 tons. 100-80= 20 tons that are still available.
3 0
2 years ago
Read 2 more answers
How do you solve p=-3w+9
pentagon [3]
P-9=-3w
-p/3+3=w
(9-p)/3=w
6 0
2 years ago
Read 2 more answers
I need help with this math problem!
Lyrx [107]

Answer:

12?

Step-by-step explanation:

i might be wrong, but from what it looks like, it shows 3 sections and one is labeled 4.

8 0
3 years ago
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