1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
AysviL [449]
3 years ago
12

Please help me on Mathematics

Mathematics
2 answers:
svetlana [45]3 years ago
7 0

Answer:

1. 20 km/h

2. 70 m/h

3. 6.5 h

4. 4.5 s

5. 184 km

Step-by-step explanation:

For first two questions, you can use the following formula:

\displaystyle \large{s = \frac{d}{t}}

I denote ‘s’ be speed, ‘d’ be distance and ‘t’ be time. Some books may use ‘v’ for speed instead of ‘s’ but I use ‘s’ variable instead so it makes the equation easier to memorize.

Therefore, speed = distance/time

( 1 ) The first question is given both distance be 60 km and time be 3 hours. Therefore:

\displaystyle \large{s=\frac{60}{3}}\\\displaystyle \large{s=20 \ \ \sf{km / h}}

So for the first question, the speed is 20 km/h

( 2 ) The second is given both distance be 140 m and time be 2 hours. Therefore:

\displaystyle \large{s=\frac{140}{2}}\\\displaystyle \large{s=70 \ \  \sf{m / h}}

Therefore, speed is 70 m/h

For the third and four questions, we will be finding time. From the speed formula:

\displaystyle \large{s=\frac{d}{t}}

Multiply both sides by t.

\displaystyle \large{st=d}

Divide both sides by s.

\displaystyle \large{t=\frac{d}{s}}

Therefore, time = distance/speed

( 3 ) The question is given speed be 40 km/h and distance be 260 km. Therefore:

\displaystyle \large{t=\frac{260}{40}}\\\displaystyle \large{t=\frac{13}{2} \ \ \sf{h}}\\\displaystyle \large{t = 6\frac{1}{2} \ \ \sf{h}}\\\displaystyle \large{t= 6.5 \ \ \sf{h}}

Therefore, time is 6.5 h

( 4 ) The question is given speed be 16 cm/s and distance be 72 cm. Therefore:

\displaystyle \large{t=\frac{72}{16}}\\\displaystyle \large{t=\frac{9}{2} \ \ \sf{s}}\\\displaystyle \large{t=4\frac{1}{2} \ \ \sf{s}}\\\displaystyle \large{t=4.5 \ \ \sf{s}}

Therefore, time is 4.5 s

For the last question, we have to find distance. From the speed formula:

\displaystyle \large{s=\frac{d}{t}}

Multiply both sides by t.

\displaystyle \large{st=d}\\\displaystyle \large{d=st}

Therefore, distance = speed * time

( 5 ) The question is given time be 4 hours and speed be 46 km/h. Therefore:

\displaystyle \large{d=46 \cdot 4}\\\displaystyle \large{ d=184 \ \ \sf{km}}

Therefore, distance is 184 km.

amm18123 years ago
4 0

Answer:

1. 20 km/hr (60km / 3h)

2. 70 m/hr (170m / 2h)

3. 6.5 hr (260cm / 40km)

4. 4.5 s (72cm / 16cm)

5. 184 km (46km * 4h)

Step-by-step explanation:

We'll use d = distance, t = time, s = speed.

Speed over time can be found by dividing distance by time

s = d / t

We can take this formula and manipulate it to find either distance or time if we know two of the values. Keeping in mind division and multiplication cancel each other.

If we wanted to find d for instance we can multiply both sides by t to get

s * t = d

For time we can divide both sides of the above formula by s to get

t = d / s

You might be interested in
Divide mentally. 6.2 ÷ 2,000 = ? A. 0.31 B. 0.031 C. 0.0031 D. 0.00031
soldi70 [24.7K]
C. 0.0031 

6.2 divided by 2,000 = 0.0031
5 0
3 years ago
These figures are similar. The
ZanzabumX [31]

Answer:

a

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
How many feet are in 20 yards
vlada-n [284]
20 x 3 = 60.

60 feet in 20 yards.
3 0
3 years ago
Read 2 more answers
Help me please i dont understand​
makkiz [27]
Distance =960 kilometers

Graph the distance (960 kilometers) it traveled is on the y-axis

Time=4 minutes

Graph the time it travels on the x-axis
6 0
3 years ago
Jason is training to run in a marathon. His goal for this week is to run a minimum of 35 miles.
Illusion [34]

Answer:

5 miles a day.

Step-by-step explanation:

if there's 35 and he has done 15 he will have to do 5 miles each day (4 days) which will be 20, when added equivalent to 35.

3 0
3 years ago
Other questions:
  • A Triangle has an area of 36cm^2. The base and height are scaled by a factor of 5. What is the area of the resulting triangle?
    6·1 answer
  • 13y-7y=9<br> Solve for y, write it as a reduced fraction.
    13·1 answer
  • ∠UVW<br> and ∠XYZ<br> are complementary angles, m∠UVW=(x−10)º<br> , and m∠XYZ=(4x−10)º<br> .
    8·1 answer
  • Which measurement statement is correct?
    9·1 answer
  • What is the 7th term of the geometric sequence where a1 = 625 and a2 = −125?
    15·1 answer
  • And the other answer???
    10·2 answers
  • New car owners were asked to evaluate their experiences in buying a new car during the past 12 months. In the survey, the owners
    14·2 answers
  • Solve for x.<br> -9x - 9 = x + 21
    11·2 answers
  • If line AB is parallel to line RS, find the value of x.
    12·1 answer
  • 1) Eight times the difference between a number and seven, is the same as when five times
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!