Ask question

Ask question

All categories

3 years ago

11

PLZ HELP IM BEING TIMED GIVING BRAINLIEST Using the square root property solve (a - 10)² = 121

2 answers:

olchik [2.2K]3 years ago

8 0

Answer:

21

Step-by-step explanation:

We know that the sqaure root of 121 = 11.

So, A - 10 = 11

=> A = 21

Alex3 years ago

3 0

Answer:

a = -1 or a = 21

Step-by-step explanation:

take square root of each side to get:

a - 10 = $\sqrt{121}$

a - 10 = 11; a = 21

a - 10 = -11; a = -1

You might be interested in

F(x)=-x^2+x<br> f(x)=−x <br> Find f(−1)

STALIN [3.7K]

Answer:

<u>Step 1: Set x to -1 in the first equation </u>

$f(x) = -x^2 + x$

$f(-1) = -(-1)^2 + (-1)$

$f(-1) = -(1) - 1$

$f(-1) = -1 - 1$

$f(-1) = -2$

<u>Step 2: Set x to -1 in the second equation </u>

$f(x) = -x$

$f(-1) = -(-1)$

$f(-1) = 1$

5 0

3 years ago

The diameters of aluminum alloy rods produced on an extrusion machine are known to have a standard deviation of 0.0001 in. A ran

Murljashka [212]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The null hypothesis is rejected this means that $\mu \ne 0.5025$

The 95% confidence interval is $0.5045608 < \mu < 0.5046392$

Step-by-step explanation:

From the question we are told that

The standard deviation is s= 0.0001

The sample size is n = 25

The sample mean is $\= x = 0.5046 \ in$

The population mean is $\mu = 0.5025 \ in$

The null hypothesis is $H_o : \mu = 0.5025$

The alternative hypothesis is $H_a : \mu \ne 0.5025$

The test statistics is mathematically represented as

$t = \frac{0.5046 - 0.5025}{ \frac{0.0001}{\sqrt{25} } }$

$t = 105$

So the p-value from the z-table is mathematically represented as

$p-value = 2 * P( z > 105)$

$p-value = 0.000$

seeing that

$p-value < \alpha$ we reject the null hypothesis

The critical value of

$\frac{\alpha }{2}$ obtained from the normal distribution table is

$Z_{\frac{\alpha }{2} } = 1.96$

The margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} }*\frac{s}{\sqrt{n} }$

=> $E = 1.96 *\frac{0.0001}{\sqrt{25} }$

=> $E =3.92 *10^{-5}$

The 95% confidence level is mathematically represented as

$\= x - E < \mu < \= x + E$

=> $0.5046 - 3.92 *10^{-5} < \mu < 0.5046 + 3.92 *10^{-5}$

=> $0.5045608 < \mu < 0.5046392$

8 0

3 years ago

An adult’s dinner costs $7. A family of 3 adults and 2 children pays $31 for their dinners.

labwork [276]

Answer:

1. 10 dollars for each child

2. a. You could have 2 children and 4 adults.

2. b. I can't figure out another solution.

Sorry. :(((

Hope this helped, tho. :))

7 0

3 years ago

Maths anwsers for this

Sergio [31]

Answer:

the area would be 15 if you use are equals 1/2 base times height

7 0

3 years ago

How can I do this I'm so stuck on this plz help

Stolb23 [73]

You're just changing the given rate into a unit rate: follow along and do the division shown and fill in the blanks. 320 ÷16 = 20

So the unit rate is $\frac{20mi}{1gal}$

8 0

3 years ago

Read 2 more answers