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Sunny_sXe [5.5K]
3 years ago
11

Suppose you run 4 miles from your house to a friends house at the speed of 7 miles per hour. When the time comes to return home,

you are tired and walk the same 4 miles home at 3 miles per hour.
(The first question is how long did you spend running to your friends house)

Mathematics
1 answer:
kenny6666 [7]3 years ago
4 0

9514 1404 393

Answer:

  a. 0.6 h

  b. 1.3 h

  c.  C -- No

  d. 4.2 mi/h

Step-by-step explanation:

a. The relationship between time (t), speed (s), and distance (d) is ...

  t = d/s

The time spent running 4 miles at 7 miles per hour is ...

  t = (4 mi)/(7 mi/h) = (4/7) h ≈ 0.6 h

__

b. The time spent walking home is ...

  t = (4 mi)/(3 mi/h) = 4/3 h ≈ 1.3 h

__

c.  C -- No, less time is spent at 7 mi/h

__

d. The average speed is ...

   s = d/t = (4 mi +4 mi)/(4/7 h +4/3 h) = (8 mi)/(40/21 h) = 4.2 mi/h

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Let a, n, b, r, and k be integers. If a = nb+r and k|a and k|b, then k|r
Kryger [21]

Answer:

Proof for k|r

Step-by-step explanation:

We are given that a, n, b, r and k are integers.

Also,

a = nb + r

Since k divides a and b, we can write,

a = rk and b = sk, where r and s are integers.

Now, we have to prove that k divides r as well that is k|r

Putting value of a and b in the equation, we get:

rk = n(sk) + r\\r = rk - nsk\\r = (r-sn)k

Since, (r-sn) is an integer, k divides r.

5 0
3 years ago
Choose the correct comparison for the numbers below.
Alexandra [31]

Answer:

A

Step-by-step explanation:

In order to compare all three numbers, you must change them all to have the same form, either all decimal form, all fraction, or all percentages.

The easiest ways to compare are decimal and percentage, as they're practically the same thing. For simplicities sake, though, let's turn all the numbers into decimal.

Since 0.85 is already in decimal form, leave it as it is.

3/4 can be turned into a decimal by putting it into a calculator, but intuitively you should know that it's 0.75. If you don't know a fraction intuitively, you just need to make the fraction into a multiple of denominator 100 and take the numerator. For example:

\frac{3}{4} * \frac{25}{25} = \frac{75}{100}

Numerator is 75.0, now simply move the decimal place up to to get the decimal form 0.75.

91% can be changed into a decimal by moving the decimal place left 2 places. 91.0% turns into 0.91.

Now that you can see the numbers, just rearrange them from least to greatest

0.75<0.85<0.91

equal to A

5 0
3 years ago
1. Two triangles have the following congruence statement: ACGI = AMPR Name all 6 pairs of corresponding congruent parts. 1.​
rodikova [14]

Answer:

\angle C \cong \angle M

\angle G \cong \angle P

\angle I \cong \angle R

\overline{CG} \cong \overline{MP}

\overline{GI} \cong \overline{PR}

\overline{CI} \cong \overline{MR}

Step-by-step explanation:

Given the congruence statement ∆CGI \cong ∆MPR, it follows that the corresponding sides of both ∆s are equal, as well as the corresponding vertices or angles. It implies that ∆CGI and ∆MPR are of the same shape and size.

✅Thus, the 6 pairs of the corresponding congruent parts of ∆CGI and ∆MPR are:

\angle C \cong \angle M

\angle G \cong \angle P

\angle I \cong \angle R

\overline{CG} \cong \overline{MP}

\overline{GI} \cong \overline{PR}

\overline{CI} \cong \overline{MR}

3 0
3 years ago
Rearrange the equation so w is the independent variable.<br> u-5=-4(w-1)
exis [7]

u-5=-4(w-1) \\u=5-4(w-1)\\u=5-4w+4\\u=-4w+9

5 0
3 years ago
ACTIVITY 1
aleksklad [387]

Answer:

Question A:

1. 1/2  = 0.5 (Terminating)

2. 5/6  = 0.833333.. (Repeating)

3. 21/3 = 1.6666666.. (Repeating)

Question B:

1. 0.6  = 3/5

2. 1.25  = 5/4 = 1 1/4

3. 0.125 = 1/8

Step-by-step explanation:

A. Write the fraction or mixed number as a terminating or repeating decimal.

In order to convert a fraction into decimal, the numerator has to be divided by denominator.

1. 1/2

The answer is: 0.5 which is a terminating decimal.

2. 5/6

The answer is: 0.833333.. which is a repeating decimal.

3. 2 1/3 (assuming the question is this)

2\frac{1}{3} = \frac{7}{6} = 1.6666666..

The answer is 1.6666666.. which is a repeating decimal.

B. Write the terminating decimal as fraction or mixed number i n simplest form.

1. 0.6

0.6 = \frac{6}{10} = \frac{3}{5}

2. 1.25

1.25 = \frac{125}{100} = \frac{5}{4} = 1\frac{1}{4}

3. 0.125

0.125 = \frac{125}{1000} = \frac{5}{40} = \frac{1}{8}

Hence,

Question A:

1. 1/2  = 0.5 (Terminating)

2. 5/6  = 0.833333.. (Repeating)

3. 21/3 = 1.6666666.. (Repeating)

Question B:

1. 0.6  = 3/5

2. 1.25  = 5/4 = 1 1/4

3. 0.125 = 1/8

7 0
3 years ago
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