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3 years ago

Evaluate the expression 2y + 3.5. Evaluate the expression for y=1.8, y=4, y=6.9. (there should be three answers)

Mathematics

1 answer:

Bond [772]3 years ago

4 0

Answer:

1. 7.1

2. 11.5

3. 24.2

Step-by-step explanation:

you use P.E.M.D.A.S. for all the equations.

so you do thr multiplication and then the addition

1. 2(1.8)+3.5= 3.6+3.5= 7.1

2. 2(4)+3.5= 8+3.5=11.5

3.2(6.9)+3.5= 13.8+3.5= 24.2

hope this helps

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Can you please help me olve theses

Mashcka [7]

<h3>Answer:</h3>

$f(x) = 0 \text{ when } x = \bold{1}$

$f(-7) =\bold{224}$

<h3>Step-by-step explanation:</h3>

Solving for the input, $\bold{x}$ , given the output:

Given:

$f(x) = 4x -4$

Solving for $x$ from the equation, $f(x) = 0$ :

$f(x) = 0 \\ 4x -4 = 0 \\ 4x = 4 \\ x = \frac{4}{4} \\ x = 1$

Solving for the output, $\bold{f(x)}$ , given the input.

Given:

$f(x) = 4x^2 -4x$

Solving $f(-7)$ :

$f(-7) = 4(-7)^2 -4(-7) \\ f(-7) = 4(49) -4(-7) \\ f(-7) = 196 +28 \\ f(-7) = 224$

7 0

3 years ago

Explain how you would factor the following equation: f(x) = xy - 5y - 2x + 10

Levart [38]

$xy - 5y - 2x + 10 \\ y(x - 5) - 2(x - 5) \\ (x - 5)(y - 2)$

So, F(X) = ( X - 5 ) ( Y - 2 )

When you wanna factor out some equation, try to spot things that are similar. Factoring is always a process of trial and error, but as you get more experience it will just get easier.

For example, in your question when you see y appear in many terms try to factor it out, and then produce what goes inside parenthesis.

3 0

3 years ago

The mean of a set of data is 45 years. Find the missing numbers in the data set {40,45,48,?,54,?,45}. Explain the method or stra

Vera_Pavlovna [14]

Answer:

42 and 41

Step-by-step explanation:

So how I did it tbh I went everywere with this but I went backwards because the how you find the mean of something is adding all the values and then dividing them by the number of values(40+41+42+45+45+48+54=315, 315divided by 7=45) but anyway 45x7(because multiplication is the opposite of division)that equals 315-232 which is the answer to 40+45+48+54+45 which were the numbers that were given

8 0

2 years ago

Jason was asked 40 questions on a quiz show. He answered 85% of the questions correctly.how many did he answered correctly

ipn [44]

Answer:

34 questions

Step-by-step explanation:

85 percent * 40 =

(85:100)* 40 =

(85* 40):100 =

3400:100 = 34

5 0

3 years ago

Solve -5x+y=1 and 9x-2y=4 using multiplication and then elimination.

omeli [17]

Answer:

x = - 6, y = - 29

Step-by-step explanation:

Elimination:

2*(-5x + y = 1) = -10x + 2y = 2

9x - 2y = 4 = + (9x - 2y = 4) =

-x = 6

x = -6

9(-6)-2y=4

-54-2y=4

-2y=58

y=-29

8 0

3 years ago