If f(x) = 2x2 - x, find f(-3).
15
21
39

Answers

Answer 1

Answer:

Its C on edge but the answer is 21

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INVERSE PROPORTIONALITY ????q is inversely proportional to the square of t
when t = 5, q = 9.6
a) find the formula for q in terms of t
b) calculate the value of q when t = 8
c) when q = 2.4, calculate the value of t

Answers

easy peasy
if you had
y is inversely proportioal as x that means
y=k/x wher k is a constant

q is invesely peorportionto the square of t
q=k/(t^2)
t=5, q=9.6
easy peasy
subsiute and find k
9.6=k/(5^2)
9.6=k/25
mutiplyb oths ides by 25
240=k

the equation is
q=240/(t^2)
when t=8 then
q=240/(8^2)
q=240/64
q=3.75

q=2.4 find t
2.4=240/(t^2)
multiply both sides by t^2
2.4t^2=240
divide both sides by 2.4
t^2=100
square root both sides
t=10

a. q= $(240)/(t^(2))$
b. q=3.75
c. t=10

Decrease 1280 by 67%

Answers

67% of 1280 is 857.6 substrack it and it's = 422.4

The length of a rectangle is 5 centimeters less than twice its width. The perimeter of the rectangle is 26 cm. What are the dimensions of the rectangle?A. length = 7 cm; width = 6 cm

B. length = 4 cm; width = 9 cm

C. length = 6 cm; width = 7 cm

D. length = 5 cm; width = 5 cm

Answers

"the length of a rectangle is 5 centimeters less than twice its width"
this translates to
L = 2W - 5

Perimeter = 2L + 2W = 26

we plug in L = 2W - 5 into 2L + 2W = 26
and get
2(2W - 5) + 2W = 26

distribute the 2
4W - 10 + 2W = 26

add like terms
6W - 10 = 26

add 10 to both sides
6W = 36

divide both sides by 6
W = 36 / 6 = 6

so the width = 6 cm

The only option with width = 6 cm is A
Therefore your answer is A

What is the least common multiple of 3 and 20 and 17?

Answers

LCM =
$3 * 20 * 17 = 1020$
Answer : LCM = 1020

Hope this helps. - M

How do I solve this?The Sugar Sweet Company is going to transport its sugar to market. It will cost $4900
to rent trucks, and it will cost an additional $175 for each ton of sugar transported. Let
C represent the total cost (in dollars), and let S represent the amount of sugar (in tons) transported. Write an equation relating C to S, and then graph your equation using the axes below.

Answers

C = 4900 + 175S

The graph will cross the y-axis at 4900 and show a slope of 175/1 . Good luck graphing. If you choose the right scale, the graph will be easier. Increment by by 500 on the yaxis and 25 on the x-axis.

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