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3 years ago

Flora records her pet hamsters weight once every week for one year. How many observations does she make?

Mathematics

2 answers:

Romashka [77]3 years ago

7 0

The answer (i think) is 52! sorry if I'm late to help!

dmitriy555 [2]3 years ago

5 0

She made about 52 observations.

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To travel 105 miles, it takes Sue, riding a moped, 3 hours less time than it takes Doreen to travel 64 miles riding a bicycle. S

Volgvan

Let t=time Doreen travels; let r=rate of Doreen

RATE * TIME = DIST.
Sue | r+13 t-3 105
Doreen | r t 64

Now solve the system:
(r+13)(t-3)=105
r*t=64

 $r= \frac{64}{t} 
\\
\\(\frac{64}{t} +13)(t-3)=105 
\\
\\64- \frac{192} {t}+13t-39-105=0
\\
\\13t- \frac{192} {t}-80=0
\\
\\ 13t^2-80t-192=0
\\
\\t_{1,2}= \frac{80\pm \sqrt{(-80)^2-4\times13(-192)} }{2\times13}= \frac{80\pm128}{26} 
\\
\\t=\frac{80+128}{26} =8
\\
\\r=\frac{64}{t} =\frac{64}{8} =8$ 

Doreen: rate = 8 mph, time = 8 hours
Sue: rate = 21 mph, time = 5 hours

8 0

3 years ago

Help Please !!!! Very Confused, do not understand how to complete these 2 questions properly.

Varvara68 [4.7K]

Answer:

11) tan(7x+3) = OE/OJ

7x+3=arctan(OE/OJ)=45

x=6

12) a) x = 40

<ajq = <acq (base angles of isosceles triangle)

50+x+90=180

x=40

b) they are congruent triangle, reason HL (hypotenuse, leg)

aj=ac

aq=qa

right angle equal

8 0

3 years ago

What are the excluded values of x for <img src="https://tex.z-dn.net/?f=%20%5Cfrac%7Bx%2B1%7D%7Bx%5E2-1%7D%20" id="TexFormula1"

NISA [10]

Denominator:

$x^2-1=(x+1)(x-1)=\big(x-(-1)\big)(x-1)$

so excluded values are x = -1 and x = 1.

Answer D.

8 0

3 years ago

Read 2 more answers

4x-5(-3) Help plzzzzzz

kaheart [24]

Answer:

4x-15

Step-by-step explanation

You just multiply -5 and -3 to simplify this.

7 0

3 years ago

The area of a rectangle is 42 square feet.

Alchen [17]

Answer:

26 ft and 46 ft.

Step-by-step explanation:

The prime factors of 42 are 2 * 3 * 7.

Possible lengths and widths are:

L = 7, W = 6 giving a perimeter of 2*7 + 2*6 = 26 ft.

L = 14 , W = 3 giving perimeter = 34 ft.

L = 21, W = 2 giving perimeter = 46 ft.

3 0

2 years ago