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2 years ago

PLEASE HELP Me!!!!!!!!!!

Mathematics

2 answers:

mote1985 [20]2 years ago

8 0

Answer:84

Step-by-step explanation:

hope this helps :))

sergey [27]2 years ago

3 0

Jolene McCall posted a new announcement in 7th period STEM 8th grade - S1

Bellwork: open a word document and type the following:
What are the 5 forms of energy?
Give an example of each to discuss in class in a few minutes.
Agenda: day 2 notes on alternate energy
Assignment chose one of the 2 to complete

Posted nov 16 by Jolene McCall

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P(x)=3x^2+12x+7 find coordinates of vertex and intercepts

kotegsom [21]

Te x intercepts are where the graph crosses the x axis or wher y=0
the y intercept is where the graph crosses the y axis or where x=0

to find vertex, here is a hack
the x coordinate of the vertex for an equation in form ax^b+bx+c=y is -b/2a

so
y=3x^2+12x+7
-b/2a=-12/2(3)=-12/6=-2
sub that back
y=3(-2)^2+12(-2)+7
y=3(3)-24+7
y=9-17
y=-8

vertex is (-2,-8)

intercepts
x intercept is where y=0

0=3x^2+12x+7
using quadratic formula
x=(-6-√15)/3 and (-6+√15)/3
xints at ((-6-√15)/3,0) and ((-6+√15)/3,0)

yint is where x=0
set x=0
y=7
yint is at y=7 or (0,7)

vertex at (-2,-8)
xints at x= $\frac{-6+ \sqrt{15} }{3}$ and $\frac{-6- \sqrt{15} }{3}$ or at the points $( \frac{-6+ \sqrt{15} }{3} , 0)$ and $(\frac{-6- \sqrt{15} }{3},0)$
yint at y=7 or at (7,0)

8 0

2 years ago

the scale on a map is 2 centimeters equals 15 Miles Dave measures the distance to the next town at 7 centimeters how many miles

jeka57 [31]

52.5 is the exact answer <span />

6 0

3 years ago

You can buy 3 T-shirts for $24. Write a proportion that gives the cost c of buying 7 T-shirts.

kolbaska11 [484]

Answer: $56

Step-by-step explanation:

Divide 24 by 3 to get 8

$8 will be the amount it'll cost for 1 t-shirt

So you would multiply 7 by 8 to get 56

So $56 will be the amount of 7 t-shirts

7 0

2 years ago

The area of a trapezium is 35cm2.find its altitude if the bases is 6cm and 8cm

r-ruslan [8.4K]

Answer: altitude: 5 cm

Explanation:

$\sf \dfrac{1}{2} ( a + b) h = Area \ of \ trapezium$

[ <u>a and b are bases, h is the altitude</u> ]

Here given:

Area = 35

a = 6

b = 8

h = ?

Solve for altitude:

$\sf \rightarrow \sf \dfrac{1}{2} ( 6 + 8) h = 35 \ \ \ \Rightarrow \ \ \ \dfrac{1}{2} ( 14) h = 35 \ \ \ \ \Rightarrow \ \ \ \ 7 h = 35 \ \ \ \ \Rightarrow \ \ h = \dfrac{35}{7} \ = \ 5$

7 0

1 year ago

F the height remains fixed and the side of the base is decreasing by 0.002 meter/yr, what rate is the volume decreasing when the

katrin [286]

The original volume equation looks like this: V = 1/3 * h * (x^2)
After the side is reduced by 0.002, the new volume would look like V1 = 1/3 * h * (x-0.002) ^ 2

Then we have:
V-V1 = 1/3*h*(x^2) - 1/3*h*(x – 0.002) ^2

= 1/3 * h *(x^2 - (x – 0.002) ^2)

= 1/3 * h * (0.004x - 0.00004)

The rate of decreasing is computed by:

(V-V1)/V * 100% = [1/3 * h *(0.004x - 0.00004)] / [1/3 * h * (x ^ 2)] * 100% this would be equal to (0.004x - 0.00004) / (x^2) * 100%

So replace x by 200, you’ll get:

(0.004(200) - 0.00004) / (200^2) * 100%

= 0.001999% is the rate of decreasing.

4 0

3 years ago

PLEASE HELP Me!!!!!!!!!!​

PLEASE HELP Me!!!!!!!!!!