All categories

3 years ago

Solve for x: 2/5=4/x

Mathematics

2 answers:

pickupchik [31]3 years ago

8 0

The answer is 10

Explanation: First you cross-multiply to get 2x=20 and then divide by 2 to get x=10

Sergeeva-Olga [200]3 years ago

6 0

9514 1404 393

Answer:

x = 10

Step-by-step explanation:

Using your number sense, you recognize that a fraction equivalent to 2/5 that has 4 in the numerator is 4/10. This tells you x = 10.

The usual instructions for solving this algebraically are to "cross multiply", then divide by the coefficient of x.

2/5 = 4/x . . . . given

2x = 20 . . . . . multiply by 5x on both sides

x = 10 . . . . . . . divide by 2

You can do the above two steps both at once: multiply by 5/2x.

(2/5)(5/2x) = (4/x)(5/2x)

x = 20/2 = 10

You might be interested in

What is 4/7 divided by 5

Lana71 [14]

Answer:

4/7/(5)=4/(7×5)=4/35

6 0

3 years ago

Please help me!!! Will get brainliest!!!

ratelena [41]

1. You already did it.
2. Table
3. t (years since 1990)
4. n (# of cigarettes sold)
5. (t, n)
6. You can see the distribution of the data pretty neatly. There are also many more advantages including it's easier to calculate standard deviation, easier to see the mean, mode and median, and it's also much easier to just tell the extrema of the dataset by just looking at the scattergram.

5 0

3 years ago

39 is what percent of 96

ra1l [238]

Answer:

40.625%

Step-by-step explanation:

This is a very simple question.

We have to understand converting word equations to algebraic ones.

"is" means "="

"of" means "*"

So, we can write:

39 = what percent * 96

Now, we let "what percent" be "p" and solve the equation for p:

39 = P * 96

So,

$39 = P * 96\\39=96P\\P=\frac{39}{96}\\P=0.40625$

Converting this decimal to percentage means multiplying by 100, so we have:

0.40625 * 100

= 40.625%

7 0

3 years ago

Uni made a model of a 1970 Ford Mustang using a scale of .5 inches = 9 in. If the actual car is 15 ft long, how long is the mode

kykrilka [37]

Answer:

The model car is 10 inches long

Step-by-step explanation:

To solve this question, we use conversion of units

Feet to inches.

Each feet has 12 inches.

The car is 15ft long.

So the car has 15*12 = 180 inches.

.5 inches = 9 in.

Rule of three

.5 inches - 9 inches

x inches - 180 inches

$9x = 180*0.5$

$9x = 90$

$x = \frac{90}{9}$

$x = 10$

The model car is 10 inches long

7 0

3 years ago

Check my proof? Two diagonals of a parallelogram bisect each other?

SIZIF [17.4K]

Your proof is correct and very well done

6 0

3 years ago