All categories

3 years ago

If f(x)=4x−7 what is f(−5)? 1. 13 2. -27 3. -13 4. 27

Mathematics

1 answer:

Xelga [282]3 years ago

3 0

Answer:

option 2

Step-by-step explanation:

Substitute x = - 5 into f(x) , that is

f(- 5) = 4(- 5) - 7 = - 20 - 7 = - 27

You might be interested in

If (-1,4) and (3,-2) are end points of diameter of the circle, then the equation of the circle is

Volgvan

Answer:

If you've more doubts you can ask :)

Step-by-step explanation:

If the centre of a circle is (a, b) and radius r, then the equation of the circle is :

$(x - x)^2 + (y-b)^2 = r^2$

First we will find the centre, (a , b):

$a = \frac{3+(-1)}{2} = \frac{2}{2} = 1\\\\b = \frac{-2 + 4}{2} = \frac{2}{2} = 1$

Find radius:

$Radius, r = \frac{Diameter}{2}$

Diameter is the distance between (-1, 4) and (3, -2)

$diameter = \sqrt{(x_2 - x_1)^2 +(y_2-y_1)^2} \\\\$

$= \sqrt{(3-(-1)^2 + (-2-4)^2} \\\\=\sqrt{16 + 36}\\\\=\sqrt{52}\\\\=\sqrt{4 \times 13}\\\\=2\sqrt{13} \ units$

Therefore , $r = \frac{2 \times \sqrt{13} }{2} = \sqrt{13} \ units$

Equation of the circle is :

$(x - 1)^2 +(y-1)^2 = 13$

4 0

3 years ago

2+x-(3-z); use x=6, and z=1

Nataly_w [17]

Answer:

Step-by-step explanation:

$2+x-(3-z)\\ x=6\\ z=1\\= 2+6-(3-1)\\\\\mathrm{Follow\:the\:PEMDAS\:order\:of\:operations}\\\\\mathrm{Calculate\:within\:parentheses}\:\left(3-1\right)\::\quad 2\\=2+6-2\\\\\mathrm{Add\:and\:subtract\:\left(left\:to\:right\right)}\:2+6-2\:\\:\quad 6$

4 0

3 years ago

Read 2 more answers

What is the slope of the line AB?

spayn [35]

Answer:

The slope of line AB is 2/1

Step by step explanation:

Hope this helps!!

6 0

3 years ago

Y varies directly as x. If x = 15 when y = 20, find x when y = 30.

Goryan [66]

Answer:

22.5

Step-by-step explanation:

y=kx

20=k15

k=1•33

30=1•33x

x=22•5

5 0

3 years ago

Someone help plz tyyyy!

Sveta_85 [38]

Answer:

When y=7,9 the answer is yes when it = -10,-8 the answer is no.

Step-by-step explanation:

Simple substitution gets us the resulting values. for y=7 we get $15\geq 15$ which is true. For y=9 we get $19\geq 15$ which is also true. For the other values we get a negative number which is not a solution.

4 0

2 years ago