MATHEMATICS HIGH SCHOOL

F (x)=2x-1 Find f (-2)
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Answers

Answer 1
Answer:

Answer:

-5

Step-by-step explanation:

f(x) =2x-1

f(-2)=2(-2)-1

2×(-2) = -4 -1= -5

f(-2)= -5

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24 % of 175 calculate this

Answers

Answer:

24/100x175 = 42

Step-by-step explanation:

24/100x175 = 42

Alex usually runs for 21 hours a week, training for a marathon. If he is unable to run for 3 days, describe how to find out how many hours of training time he loses, and write the appropriate integer to describe how it affects his time

Answers

Alex usually runs for 21 hours a week.  We know that there are 7 days in a week.  21/7 = 3, which means that Alex runs for 3 hours each day.

We are trying to figure out how much time he loses if he is unable to run for three days.  3 * 3 = 9.  This means he loses 9 hours of training while he is unable to run.
Assuming he runs the same number of hours per day, then he runs 3 hours per day (21/7). 
If he runs 3 hours a day, then in 3 days he would have ran 9 hours (3*3). 

He loses 9 hours of training if he doesn't run for 3 days.

How to draw a parallelogram that has 4 parallel lines

Answers

It is impossible to draw a parallelogram with 4 parallel lines (or to draw any quadrilateral with 4 parallel lines, for that matter).

Use the zeros of the following quadratic to find the x-value of the vertex.y = x2 – 4x – 5
A.5
B.2
C.–2
D.–5

Answers

1. y = x^2 - 4x - 5
= x^2 - 4x + 4 - 4 - 5
= (x^2 - 4x + 4) -4 - 5
y = (x-2)^2 - 9 Here, the vertex is at (2, -9) 

2. x = 2 (the vertical line that goes through the vertex) 
3. The graph of this function is called a parabola. To graph a parabola, use 
its vertex (in this case, (2, -9) ) and y-intercept (y = -5). The y-intercept is the constant in the given equation. Use the fact that the vertical line through the vertex is a line of symmetry. Plot the point corresponding to the y-intercept that lies on the other side of the vertical line x = 2. 

4. The graph is translated 2 units to the right and 9 units down.

Answer:

The answer is B.) 2

(on e2020)

Andre received $60 for his birthday and put it in his piggy bank. Each week, he puts 3 more dollars in his bank. The amount of money in dollars D in his bank is given by D = 3w + 60, where w is the number of weeks he has saved 3 dollars. His sister Lana makes a table of reasonable values for w. Lana selects 12 as a value for w. What is the corresponding table entry for D?


A.
372


B.
96


C.
75


D.
64

Answers

96 → B

substitute w = 12 into the equation D = 3w + 60

D = (3 × 12 ) + 60 = 36 + 60 = 96

Consider the quadratic function f(x) = −² − 3x + 10.Determine the following: (enter all numerical answers as integers, fractions, or decimals):
The z-intercepts are
The y-intercept is
The vertex is
The line of symmetry has the equation
Give your answers as points, separated by a comma
Give your answer as a point.
Can someone help me please. Precalc is hard!!!

Answers

1. the z-intercepts are (-2, 0) and (2.5, 0)
2. the y-intercept is (0, 10)
3. the vertex is (-0.75, 10.75)
4. the line of symmetry has the equation x = -0.75
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