All categories

3 years ago

Which number is a solution of a^2+4=6a-1

Mathematics

1 answer:

nadya68 [22]3 years ago

5 0

Just move all terms to the left side and set equal to zero. Then, set each factor equal to zero.
a = 5,1

You might be interested in

Given segment AC and point B lies on AC <br> Find CB if AC = 51, AB = 6-5x, and CB = 49 + 6x

katovenus [111]

Answer

3.9 round to 4 ish

Step-by-step explanation:

hey, I'm not sure if I did this right but the way I did it it's what I'm learning so if you get it wrong I apologize.

3 0

3 years ago

True or False: To convert 50 hectares to acres, divide 50 by 4.05 × 10-1

Stels [109]

the answer is true so yawelcome

7 0

3 years ago

How do you graph an absolute value with an extra number?

Anna [14]

It is a verticle shift (down one)

4 0

3 years ago

Read 2 more answers

Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.

blsea [12.9K]

Answer:

a) Percentage of students scored below 300 is 1.79%.

b) Score puts someone in the 90th percentile is 638.

Step-by-step explanation:

Given : Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.

(a) If the average test score is 510 with a standard deviation of 100 points.

To find : What percentage of students scored below 300 ?

Solution :

Mean $\mu=510$ ,

Standard deviation $\sigma=100$

Sample mean $x=300$

Percentage of students scored below 300 is given by,

$P(Z\leq \frac{x-\mu}{\sigma})\times 100$

$=P(Z\leq \frac{300-510}{100})\times 100$

$=P(Z\leq \frac{-210}{100})\times 100$

$=P(Z\leq-2.1)\times 100$

$=0.0179\times 100$

$=1.79\%$

Percentage of students scored below 300 is 1.79%.

(b) What score puts someone in the 90th percentile?

90th percentile is such that,

$P(x\leq t)=0.90$

Now, $P(\frac{x-\mu}{\sigma} < \frac{t-\mu}{\sigma})=0.90$

$P(Z< \frac{t-\mu}{\sigma})=0.90$

$\frac{t-\mu}{\sigma}=1.28$

$\frac{t-510}{100}=1.28$

$t-510=128$

$t=128+510$

$t=638$

Score puts someone in the 90th percentile is 638.

5 0

3 years ago

I have more to come help please:(

Serggg [28]

Maaaaane I’m sorry I can’t help

4 0

3 years ago