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MAXImum [283]
3 years ago
9

Divde 3/4÷5/7 what was the error 5/7÷3/4=5/7*4/3=20/21

Mathematics
1 answer:
Setler79 [48]3 years ago
7 0

instead of changing the 5/7 u change the 3/4

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If an addition expression gives the same value as a multiplication expression, what is an advantage of using either method? PLEA
MakcuM [25]

Answer:

Write the expression (−15.5) + 35.5 in a different way, using the commutative

8 0
3 years ago
5)Write an algebraic equation for each statement, and then SOLVE for x
Andrei [34K]

Answer:

Step-by-step explanation:

1. x+6=14

  14-6=8

  x=8

2. 15/x=3

   15/3=x

   x=5

3. 7*x=56

   56/7=8

   x=8

4. x^2-4=12

  x=4, x=-4

5. 1/4x=10

  x/4 = 10

  x = 40

6. 3x-9=18

    x=9

7. 1/2x-10=14

   x/2-10=14

   x=48

8.x/8=9

   8*9=72

  x=72

9.2x+3=24

   2x=21

 x=21/2

10.20*x=140

   140/20=7

   x=7

8 0
3 years ago
A truck was driven a 140 miles in 3 1/2 hours. If a car is driven the same distance at an average speed of 20 miles an hour fast
densk [106]

Find the speed of the truck:

140 miles / 3.5 hours = 40 miles per hour

The car was 20 miles an hour faster: 40 + 20 = 60 miles per hour.

Divide distance by speed: 140 miles / 60 miles per hour = 2 1/3 hours

Answer: 2 1/3 hours

8 0
2 years ago
Read 2 more answers
The demand for a daily newspaper at a newsstand at a busy intersection is known to be normally distributed with a mean of 150 an
AURORKA [14]

Answer:

171 newspapers.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 150, \sigma = 25

How many newspapers should the newsstand operator order to ensure that he runs short on no more than 20% of days

The number of newspapers must be on the 100-20 = 80th percentile. So this value if X when Z has a pvalue of 0.8. So X when Z = 0.84.

Z = \frac{X - \mu}{\sigma}

0.84 = \frac{X - 150}{25}

X - 150 = 0.84*25

X = 171

So 171 newspapers.

4 0
3 years ago
Solve the equation. 5x+8-3x=-10
Crank

Answer:

This: Im sorry but, I can't type it all, I just looked up some help.

Step-by-step explanation:

You can rewrite the equation as

5

x

−

3

x

+

8

=

−

10

Then

5

x

−

3

x

=

2

x

So

2

x

+

8

=

−

10

Then, to move the whole numbers to one side, you subtract

8

from both sides

2

x

=

−

18

To get rid of the

2

in front of the

x

, divide both sides by

2

x

=

−

9

6 0
3 years ago
Read 2 more answers
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