All categories

2 years ago

HELP ME PLEASE!!! This is my last day

Mathematics

1 answer:

KiRa [710]2 years ago

7 0

Answer:

B : 91.25, V: 365
B:12.25, V: 42.875
B:28.4, V: 142
B:32.2, V: 293.02

You might be interested in

How do I solve #9? For the past three months, Grace used her cell phone bla bla bla

notsponge [240]

Answer: 58 minutes
55*4=220
62+57+43=162
220-162=58

6 0

3 years ago

Read 2 more answers

Use the information from the polling agency to determine the sample size needed to construct a 95% confidence interval with a ma

Ber [7]

Answer:

the sample size n= 771

sample proportion is p = 1/2

Step-by-step explanation:

Step1:-

marginal error formula is $\frac{2S.D}{\sqrt{n} }$

but if 'n' is sample size then $n = \frac{1}{(margin error)^{2} }$

Given margin error is 36% = 0.036

$n= \frac{1}{(0.036)^2}$

on simplification , we get n= 777 polling agencies

Step 2:-

$Margin of error = \frac{2\sqrt{p(1-p)} }{\sqrt{n} }$

substitute values , we get

$\frac{36}{100} = \frac{2\sqrt{p(1-p)} }{\sqrt{771} }$

after simplification, we get

$\sqrt{p(1-p)} = \frac{1}{2}$

squaring on both sides, we get

$p(1-p) = \frac{1}{4}$

multiply 'p' inside

$p-p^{2} =\frac{1}{4}$

cross multiplication '4' and simplify

$4p^{2} -4p +1 =0$ ........(1)

finding 'p' value

The equation (1) is of the form $(a-b)^{2} = a^{2} -2ab+b^{2}$

$(2p)^{2} -2(2p)(1)+1^{2} = (2p-1)^2$

$(2p-1)^2 =0$

$p=\frac{1}{2}$

conclusion:-

The sample size is 771

the sample proportion is p = $\frac{1}{2}$

4 0

2 years ago

What is the solution of log4x − 616 = 4? x = −2 x = 2 x = 3 x = 4

ivolga24 [154]

This is how to solve for log expressions.
First, do the arithmetic such that all that can be solved is in the other side, besides log.
There are different properties of log to help you solve log expressions.

log4x − 616 = 4
log4x = 620
Change how it is written to solve for x.
x^620 = 4
This makes no sense so we try again.

Or, this could be solved differently.
log 4x-6 16 = 4
(4x-6) ^4 = 16
256x - 1296 = 16
x = 5.125

Final answer: x = 5

3 0

3 years ago

A gallon of water weighs 8.354 pounds. Simon uses 11.81 gallons of water while taking a shower. About how many pounds of water d

liq [111]

8.354•11.81=98.66074 pounds Because the question is asking "about" how much that water weighs, I would round he answer to 99 pounds

4 0

2 years ago

Please help me with this

Shkiper50 [21]

Answer:

$\frac{PQ}{DE}$ = $\frac{QR}{EF}$ = $\frac{PR}{DF}$