All categories

3 years ago

What’s the simplified value of 12.4x(-6.3)

Mathematics

1 answer:

Eddi Din [679]3 years ago

5 0

Answer:

-78.12

Step-by-step explanation:

You might be interested in

What is the value of the expression -10-(-20)

mart [117]

Answer:

Step-by-step explanation:

-10-(-20)

A negative and a negative is addition

-10+20=10

5 0

3 years ago

Read 2 more answers

How much greater 20 than 12?

Ber [7]

20 is 8 greater than 12.

6 0

3 years ago

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

3 years ago

Arthur has 6 more than 5 times the number of pencils as Jenny. If Arthur and Jenny combined have 30 pencils, how many pencils do

Doss [256]

Answer:

4.8

Step-by-step explanation:

4.8x5= 24

24+6= 30

5 times= multiply by 5

6 more= add 6

5 0

3 years ago

Sin theta= -4/5, tan theta >0

Maru [420]

sin(θ) = ⁻⁴/₅
sin⁻¹[sin(θ)] = sin⁻¹(⁻⁴/₅)
θ ≈ -53.13

tan(θ) > 0
tan(53.13) > 0
1.33 > 0

8 0

4 years ago