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3 years ago

PLEASE HELP I HAVE TO TURN THIS IN SOON 6/7 GRADE MATH

Mathematics

1 answer:

Aleksandr-060686 [28]3 years ago

5 0

first get a table that tells i how many miles per hour and the rest idk sorry hope it helped

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Victoria earns $255 by working 20 hours each week

Alborosie

She would make $98.50 in 10 hours.

Explanation :
255/20 = 12.75
12.75 - 2.90 = 9.85
9.85 x 10 = 98.50

6 0

3 years ago

A model car travels around a circular track with radius 5 feet. Let Z denote the distance between the model car and a fixed poin

Eddi Din [679]

Answer:

$\frac{dZ}{dt}$ = $\frac{40}{\sqrt{545} }$ , so the model car is moving away from the fixed point at a rate of approximately 1.7 feet per second.

Step-by-step explanation:

The functions x and y satisfy (x−20)^2+y^2=25 and differentiating gives 2(x−20)dx/dt+2y dy/dt=0. Substituting the three known values and solving for dy/dt yields dy/dt=−32. Since Z=x^2+y^2−−−−−−√, dZ/dt=(2x ^ dx/dt+2y^dy/dt) / 2x2+y2√. Substituting Since Substituting for x, y, $\frac{dx}{dt}$ , and $\frac{dy}{dt}$ gives $\frac{dZ}{dt}$ = $\frac{40}{\sqrt{545} }$ ,

5 0

3 years ago

(b) If a series follows geometric progression, show that the ratio of the sum of term to the sum from (n+1) term to (2n) term is

Nadusha1986 [10]

Proof with explanation:

We know that the sum of first 'n' terms of a Geometric progression is given by

$S_{n}=\frac{a(1-r^{n})}{1-r}$

where

a = first term of G.P

r is the common ratio

'n' is the number of terms

Thus the sum of 'n' terms is

$S_{n}=\frac{a(1-r^{n})}{1-r}$

Now the sum of first '2n' terms is

$S_{2n}=\frac{a(1-r^{2n})}{1-r}$

Now the sum of terms from $(n+1)^{th}$ to $(2n)^{th}$ term is $S_{2n}-S_{n}$

Thus the ratio becomes

$\frac{S_{n}}{S_{2n}-S_{n}}\\\\=\frac{\frac{a(1-r^{n})}{1-r}}{\frac{a(1-r^{2n})}{1-r}-\frac{a(1-r^{n})}{1-r}}\\\\=\frac{1-r^{n}}{r^{n}-r^{2n}}\\\\=\frac{1-r^{n}}{r^{n}(1-r^{n})}\\\\=\frac{1}{r^{n}}$

5 0

3 years ago

Yes im dumb but i pretty much missed my education of 7th and now im 8th personal reasons and i need to at least get my grades up

Diano4ka-milaya [45]

Answer:

1. A

2. B

3. (-3.5 , -6) --- III

(-4 , 0)------- x-axis

(9 , -2)------- II

(8 , 3)-------- I

7 0

3 years ago

a population of 140,000 grows 3% per year for 14 years. how much will the population be after 14 years?

xeze [42]

Answer:

58800

Step-by-step explanation:

3% = 4200

4200 x 14 = 58800

5 0

3 years ago

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