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3 years ago

4/5=10/x Solve the proportion

Mathematics

2 answers:

Flura [38]3 years ago

5 0

12.5 = X

Cross multiply, which makes 4x=50
Then divide 4 from 50 and get 12.5

pogonyaev3 years ago

3 0

Hello, first, we cross mutliply, 4*x=10*15=4x=50, 4x/4=50/4. Simplify 50/4 to 25/2, So, the answer is x=25/2

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Please help!!

yarga [219]

Because this is a fourth degree that will be tricky to factor as it is, we will do a u substitution. Let $x^2=u$ . We can now rewrite that polynomial in terms of u: $u^2-7u-8=0$ . Filling into the quadratic formula we have $u=\frac{7+/-\sqrt{49-4(1)(-8)}}{2}$ . Simplifying down $u=\frac{7+/-\sqrt{81}}{2}$ and $u=\frac{7+9}{2}$ or $u=\frac{7-9}{2}$ . That means that u = 8 or u = -1. But don't forget that we let $u=x^2$ , so we have to put x-squared back in for u. That gives us $x^2=8$ which simplifies down to $+/-2\sqrt{2}$ . That also gives us $x^2=-1$ . When we take the square root of -1, we have to use the fact that -1 = i^2, so we sub that in to get $x=+/-i$ . All in all, your solutions are as follows: $2\sqrt{2},-2\sqrt{2},i,-i$ which is choice b.

7 0

3 years ago

~I ~ need ~ help ~ once ~ again~

ruslelena [56]

A. 12pi meters.

Circumference = pi x diameter (pi x 12 = 12pi)
Diameter = 2 x radius (2 x 6 = 12)

8 0

3 years ago

Determine an interest rate less than 15%, a period of investment greater than two years, and a regular payment that will result

Alborosie

13%, 5 years, 2500 could most likely maybe be the answer a question

7 0

3 years ago

240 is 240% of what number?

dybincka [34]

240 is 240% of 576
240% x 240 = x
(240 x 240) divide by 100
57,600 divide by 100 = 576 x = 576

5 0

4 years ago

Read 2 more answers

Nwhat is the range of data set for 8 1 7 6 14

bazaltina [42]

Answer:

14-1=13 range= 13

Step-by-step explanation:

The range of a set of data is the difference between the highest and lowest values in the set. To find the range, first order the data from least to greatest. Then subtract the smallest value from the largest value in the set.

4 0

3 years ago