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3 years ago

Which is a composite number 9, 11, 31

Mathematics

2 answers:

olga55 [171]3 years ago

3 0

I mean 9 is a composite number

Lelu [443]3 years ago

3 0

A composite number:
9

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A Cepheid variable star is a star whose brightness alternately increases and decreases. For a certain star, the interval between

sattari [20]

Answer:

$B'(t) = \dfrac{0.9\pi}{4.4}\cos\bigg(\dfrac{2\pi t}{4.4}\bigg)$

b) 0.09

Step-by-step explanation:

We are given the following in the question:

$B(t) = 4.2 +0.45\sin\bigg(\dfrac{2\pi t}{4.4}\bigg)$

where B(t) gives the brightness of the star at time t, where t is measured in days.

a) rate of change of the brightness after t days.

$B(t) = 4.2 +0.45\sin\bigg(\dfrac{2\pi t}{4.4}\bigg)\\\\B'(t) = 0.45\cos\bigg(\dfrac{2\pi t}{4.4}\bigg)\times \dfrac{2\pi}{4.4}\\\\B'(t) = \dfrac{0.9\pi}{4.4}\cos\bigg(\dfrac{2\pi t}{4.4}\bigg)$

b) rate of increase after one day.

We put t = 1

$B'(t) = \dfrac{0.9\pi}{4.4}\cos\bigg(\dfrac{2\pi t}{4.4}\bigg)\\\\B'(1) = \dfrac{0.9\pi}{4.4}\bigg(\cos(\dfrac{2\pi (1)}{4.4}\bigg)\\\\B'(t) = 0.09145\\B'(t) \approx 0.09$

The rate of increase after 1 day is 0.09

8 0

3 years ago

Gage had $100,000 in a CD at Lots-a-Loot Bank, which just failed. If the FDIC

SIZIF [17.4K]

Answer: $100,000 APEX!!!!!!!!!!

Step-by-step explanation:

8 0

3 years ago

A landscaper is designing a flower garden in the shape of a trapezoid. She wants the length of the shorter base to be 3 yards gr

gizmo_the_mogwai [7]

Correct Answer:
Option A. 17.1 Yards

Solution:
Let the height of trapezium is x yards. According to the given data, we can express the lengths of bases in terms of height.

The short base is 3 yards greater than the height, so measure of short base will be (x+3) yards.

The longer base is 5 yards greater than the height, so measure of longer base will be (x+5) yards.

Area of trapezium is given to be 360 square yards.

Area of trapezium = 0.5 x (Height) x (Sum of Bases)

Using the values, we get:

$360=0.5(x)(x+3+x+5) \\ \\ 
720=x(2x+8) \\ \\ 
2 x^{2} +8x-720=0 \\ \\ 
2( x^{2} +4x-360)=0 \\ \\ 
 x^{2} +4x-360=0 \\ \\ 
x= \frac{-4+- \sqrt{16-4(1)(-360)} }{2} \\ \\ 
x= \frac{-4+- \sqrt{1456} }{2} \\ \\ 
x = 17.1 , -21.1$

Since the height cannot have a negative value, we conclude that the height of trapezium rounded to nearest tenth of a yard will be 17.1 yards.

7 0

3 years ago

Could any help me wit this ?

Step2247 [10]

Second, Fourth and Sixth options are right..
Please mark brainliest!

8 0

3 years ago

Make a list of 5 numbers with a mean of 12 and a mode of 15. If someone could help me out with this please, that would be very n

babymother [125]

Answer: 9 10 11 15 15

Explanation:

$\textnormal {Mean = } \cfrac{9+ 10 + 11 + 15 + 15}{5} = 12$

$\textnormal {Mode = } 15$

The Wise Orange is nice.

7 0

3 years ago