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cluponka [151]
3 years ago
13

Can someone help me with this?

Mathematics
1 answer:
zvonat [6]3 years ago
4 0
Sorry, don't have time to do them right now but I know who does!

http://www.wolframalpha.com/widgets/view.jsp?id=ae438682ce61743f90d4693c497621b7

Just plug in 2 at a time.
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Jack bought a stereo on sale for $231 . The original price was $385 . What was the percent of decrease in a price
Alenkinab [10]
231 / 385 = 0.6        diving the price it is by the price is was gives the answer
= 60%
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3 years ago
Susie spent $78 in 3 hours. How much did Susie spend per hour?
mart [117]

Answer:

$26

Step-by-step explanation:

78 divided by 3

3 0
3 years ago
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If x = -3 is a zero of f(x), which of the following must be true?
Alla [95]

Answer: B

Step-by-step explanation: You make the values in the parentheses equal to zero.

(X + 3) = 0

X = -3

A is wrong because the root would be 3, not negative 3. C is wrong because 3 isn’t guaranteed to be a root. D is wrong because -3 is a real solution.

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3 years ago
Draw a line for the axis of symmetry of function f. Also mark the x-intercept(s), y-intercept, and vertex of the function. f(x)
lilavasa [31]

Answer:

<u>Part A:</u>  vertex at (-1,4)

<u>Part B:</u>  line of symmetry x =-1

<u>Part C:</u>  x-intercept x = -3 and x = 1

<u>Part D:</u>  y-intercept y = 3

Step-by-step explanation:

Given f(x) = - (x+1)² + 4

The given equation represents a parabola.

The general equation of the parabola with a vertex at (h,k)

f(x) =  (x-h)² + k

<u>Part A:</u> To find the vertex, compare the general equation with the given function.

<u>So, the vertex of the function will be at (-1,4)</u>

<u>Part B:</u> the line for the axis of symmetry of function will be at <u>x =-1</u>

<u>Part C: </u>To find x-intercept, put y = 0

So, - (x+1)² + 4 = 0

- (x+1)² = -4

(x+1)² = 4

x + 1 = ±√4 = ±2

x + 1 = 2  OR   x + 1 = -2

x = 1  OR x =-3

x-intercept at x = 1 and x = -3

<u>Part D:</u>To find y-intercept, put x = 0

So, y = - (0+1)² + 4 = -1 + 4 = 3

y-intercept at  y = 3

<u>See the attached figure.</u>

8 0
3 years ago
Read 2 more answers
A chair's regular price is $349. It is on clearance for 30% off, and a customer uses a
Nady [450]

Answer:

68.055

Step-by-step explanation:

349-30%=104.7-15%=68.055

3 0
3 years ago
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