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3 years ago

The sum of 3 times a number and 7 is 25

Mathematics

2 answers:

Maru [420]3 years ago

7 0

Answer: your answer would be 15+3*1+7=25

Step-by-step explanation: 15+3 makes 18

18*1=18

18+7=25

hammer [34]3 years ago

5 0

Mathematically written:

3 * x + 7 = 25

3x + 7 = 25

3x = 25 - 7

3x = 18

x = 18 / 3

x = 6

Proof:

3 * 6 + 7 = 25

18 + 7 = 25

25 = 25 → both sides of the equation are equal, our answer is correct

Notes:

A number - Is an unknown number, called a variable, which in this case is substituted by the letter x.

Hope it helped,

BioTeacher101

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Use the quadratic formula to solve the equation x^2-7x-6=0

olganol [36]

Answer:

$\frac{7\pm\sqrt{73}} {2}$

Explanation:

We have been given with the quadratic equation $x^2-7x-6=0$

We have general formula to find the roots of a quadratic equation first we find the discriminant with formula

$D=b^{2}-4ac$

and after that to find the variable suppose x we have the formula

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And general quadratic equation is

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On comparing the given quadratic equation with genral quadratic equation we will have values

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After substituting these values in the formula we will get

$D=(-7)^2-4(1)(-6)={73}$

After substituting in the formula to find x we will get

$\frac{-(-7)\pm\sqrt{73}} {2}= \frac{7\pm\sqrt{73}} {2}$

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3 years ago

In response to very high demand, a new bike has been marked up by 25% and is now selling for 210.00. how much was the bike befor

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Need help plz.......

Maru [420]

Answer:

oh I see. that's an interesting question but the problem is I hate maths

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