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3 years ago

18. Solve the quadratic equation by using the graph. Look at screenshot

Mathematics

1 answer:

Rasek [7]3 years ago

3 0

Step-by-step explanation:

As seen from the graph, the curve crosses the x-axis when x = -1 and x = 1. The y-intercept of the curve is -1.

Hence, the quadratic equation of the curve is y = x^2 - 1.

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The area of the surface of an office desk is 12 square feet. The desk is 2 feet wide. How long is it?

Over [174]

Answer:

Length is 6 feet

Step-by-step explanation:

l=A

w=12

2=6

hope you get it right

8 0

3 years ago

A bag contains 5 red balls and 6 green balls. You plan to select 2 balls at random. Determine the probability of selecting 2 gre

Umnica [9.8K]

Step-by-step explanation:

first pick has probability

$\frac{6}{11}$

second pick has probability

$\frac{5}{10}$

combined probability is

$\frac{30}{110} = \frac{3}{11}$

7 0

2 years ago

Which represents a side length of a square that has an area of 450 square inches?

amm1812

The formula of an area of a square:

$A=a^2$

a - a side

We have $A=450\ in^2$

substitute:

$a^2=450\to a=\sqrt{450}\\\\a=\sqrt{225\cdot2}\\\\a=\sqrt{225}\cdot\sqrt2\\\\\boxed{a=15\sqrt2\ in}$

Used:

$\sqrt{a\cdot b}=\sqrt{a}\cdot\sqrt{b}$

5 0

2 years ago

Please help :( <br><br><br> Look at the photo

alukav5142 [94]

x intercept = (1,0)

y intercept = (0,-3)

if you have more problems you an use desmos.com and go to where it says f(x) expression

4 0

3 years ago

Raul received a score of 75 on a history test for which the class mean was 70 with a standard deviation of 7. He received a scor

JulsSmile [24]

Answer:

history test

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

He did better relative to the class in the test in which he had a higher Z score.

So:

History

Raul received a score of 75 on a history test for which the class mean was 70 with a standard deviation of 7. So we have $X = 75, \mu = 70, \sigma = 7$