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3 years ago

I need help with this answer

Mathematics

1 answer:

8_murik_8 [283]3 years ago

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And I need help with my gradez

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a cable installer charges $42.50 per hour plus a $60.00 service charge your fathers firm hires him to hook up his companys inter

denis23 [38]

$208.75 because $42.50 x 3.5= 148.75 but you have to add the 60 so 148.75+60=208.75 I hope this helps, if not, I can explain more.

6 0

3 years ago

If x=2/3 and x=-3 are the roots of the equation ax^2+7x+b=0 find the values of a and b

Gnesinka [82]

ANSWER:

If x = $\frac{2}{3}$ and x = -3 are the roots of the equation, then values of a and b are 3, -6

SOLUTION:

Given, quadratic equation is $a x^{2}+7 x+b=0$ and its roots are -3 , $\frac{2}{3}$

We know that, for any quadratic equation of form $a x^{2}+b x+c=0$ with roots $x_{1} and x_{2}$ then,

Sum of roots $(x_{1} +x_{2})$ = $\frac{-b}{a}$

Product of roots ( $x_{1} \times x_{2})$ = $\frac{c}{a}$

Now, for given quadratic equation $x_{1}$ = -3 and $x_{2}$ = $\frac{2}{3}$

hence Sum of roots = $\frac{-7}{a}$

$x_{1} + x_{2} = \frac{-7}{a}$

$-3 + \frac{2}{3} = \frac{-7}{a}$

on solving we get "a" = 3

Now product of roots = $x_{1} \times x_{2} = \frac{b}{3}$

$-3 \times \frac{2}{3} = \frac{b}{3}$

b = -6

hence, the values of a and b are 3, -6.

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4 years ago

3- -27x'yó SOMEONE HELP ASAPPP

olga2289 [7]

Answer:

24. 18.2360564556

Step-by-step explanation:

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3 years ago

What is the square root of 64y^16?

iris [78.8K]

8y^8. Square root of 64 is 8 and for exponents you divide by 2 to find its square root

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3 years ago

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What is the domain of (9c+160)/5

VARVARA [1.3K]

the domain: no real numbers so its negative infinity, positive infinity

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3 years ago