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4 years ago

Please help! (: I know the middle one is 3

Mathematics

2 answers:

Olenka [21]4 years ago

5 0

When x = -2, f(x) = -7(-2) + 3 = 14 + 3

x = 17

When x = 5, f(x) = -7(5) + 3 = -35 + 3

x = -32

All you have to do to solve the function is substitute the value of x into the equation.

Lerok [7]4 years ago

5 0

Answer:

when x=-2, f(x)=17

when x=0, f(x)=3

when x=5, f(x)=-32

Step-by-step explanation:

f(x)=-7x+3 when x=-2, 0 and 5

when x=-2,

f(x)=f(-2)

=-7*(-2)+3

=14+3

=17

when x=0,

f(x)=f(0)

=-7*(0)+3

=0+3

when x=5,

f(x)=f(5)

=-7*(5)+3

=-35+3

=-32

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3 years ago

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3 years ago

Solve each system by elimination.

meriva

Answer:

4.)

a. x= -6 y-3

b. x= 5 y + 13

4 4

3.)

a. x= -4y + -8

5 5

b. x= 3 y+3

Step-by-step explanation:

4.)

a. 5x+6y=-15

Add -6y to both sides.

5x+6y+−6y=−15+−6y

5x=−6y−15

Divide both sides by 5.

5x ÷ 5= -6y-15 ÷5

x= -6 y-3

b. 4x - 5y=13

Add 5y to both sides

4x−5y+5y=13+5y

4x=5y+13

Divide both sides by 4

4x÷4= 5y+13÷4

x= 5 y + 13

4 4

5.)

a. (5x+4y=-8)

Add -4y to both sides

5x+4y+−4y=−8+−4y

5x=−4y−8

Divide both sides by 5

5x÷5= -4y-8÷5

x= -4y + -8

5 5

b. 2x - 3y = 6

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3 years ago

In a study conducted in the United Kingdom about sleeping positions, 1000 adults in the UK were asked their starting position wh

Lady_Fox [76]

Answer: = ( 0.411, 0.409)

Therefore at 95% confidence interval (a,b) = (0.411, 0.409)

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean gain x = 0.41

Standard deviation r = 0.016

Number of samples n = 1000

Confidence interval = 95%

z(at 95% confidence) = 1.96

Substituting the values we have;

0.41+/-1.96(0.016/√1000)

0.41+/-1.96(0.000506)

0.41+/-0.00099

0.41+/-0.001

= ( 0.411, 0.409)

Therefore at 95% confidence interval (a,b) = (0.411, 0.409)

4 0

4 years ago