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4 years ago

1/4x+1/5x=81 what does x=

Mathematics

2 answers:

Ierofanga [76]4 years ago

8 0

Step-by-step explanation:

here,

1/4x+1/5x=81

or, 1+1/4x+5x=81

or, 2/9x=81

or,2/x=81/9

or,2/x=9

or, x=9*2

so,x=18

Stells [14]4 years ago

3 0

Answer:

x = 180

Step-by-step explanation:

plug it in a calculator like 1/4x + 1/5x = 81 then go down till y o uget 81 81

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KatRina [158]

Answer: Third Option

$x=1.469743$

Step-by-step explanation:

We have the following exponential equation

$3^{x+1}=15$

We must solve the equation for the variable x

To clear the variable x apply the $log_3$ function on both sides of the equation

$log_3(3^{x+1})=log_3(15)$

Simplifying we get the following:

$x+1=log_3(15)$

To simplify the expression $log_3 (15)$ we apply the base change property

$log_b(y)=\frac{log(y)}{log(b)}$

This means that:

$log_3 (15)=\frac{log(15)}{log(3)}$

Then:

$x+1=\frac{log(15)}{log(3)}$

$x=\frac{log(15)}{log(3)}-1$

$x=1.469743$

6 0

3 years ago

Please help me with this problem i have been struggling!

adoni [48]

Answer:

First multiply

1 and 3/4 by 8 and then you got your answer

5 0

3 years ago

Read 2 more answers

What is the best approximation of the value of w? 1. 4 cm 4. 0 cm 6. 0 cm 7. 3 cm.

MrRissso [65]

To solve the problem we must know about Sine Rule.

The sine rule of trigonometry helps us to equate the side of the triangles to the angles of the triangles. It is given by the formula,

$\dfrac{Sin\ A}{\alpha} =\dfrac{Sin\ A}{\beta} =\dfrac{Sin\ A}{\gamma}$

where

Sin A is the angle and α is the length of the side of the triangle opposite to angle A,
Sin B is the angle and β is the length of the side of the triangle opposite to angle B,
Sin C is the angle and γ is the length of the side of the triangle opposite to angle C.

The value of w is 4.0 cm.

Given to us