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4 years ago

How can you simplity x^2+2x-35/x^2+4x-21?

Mathematics

1 answer:

Kamila [148]4 years ago

6 0

Answer:

Step-by-step explanation:

Factor the numerator(x+7)(x-5). Then factor the denominator(x+7)(x-3). The x+7 in the top and bottom cancel. So you are left with x-5 in the numerator and x-3 in the denominator.

You might be interested in

What is 6 4/5 divided 3 2/9

aliina [53]

I hope this helps you

6 4/5= 6.5+4/5=30+4/5=34/5

3 2/9=3.9+2/9=27+2/9=29/9

34/5÷29/9

34.9/5.29

306/145

2,110

5 0

4 years ago

An economist wishes to conduct a survey in two different cities in the same county to determine the difference in the proportion

slamgirl [31]

Answer:

The minimum sample size needed for each city = 922

Step-by-step explanation:

From the information given:

the objective is to find the minimum sample size needed for each city so that the margin of error not to exceed 6%.

If we take a look at the question very well:

we are only given the confidence interval of 99% and the margin of error of 6%

we were not informed or given the value or estimate of any proportions>

so we assume that:

$p_1 =q_ 1= p_2 = q_2 = 0.5$

At confidence interval of 0.99 , the level of significance = 1 - 0.99 = 0.01

The critical value for $z_{\alpha/2} = z_{0.01 /2}$

= $z_{0.005}$ = 2.576

The minimum sample size needed can be calculated by using the formula :

$n = \dfrac{z^2_{\alpha/2}}{E^2}(p_1q_1+p_2q_2)$

$n = \dfrac{2.576^2}{0.06^2}((0.5 \times 0.5)+(0.5 \times 0.5))$

$n = \dfrac{6.635776}{0.0036}(0.25+0.25)$

$n =1843.271 \times (0.5)$

n = 921.63

n $\simeq$ 922

∴ The minimum sample size needed for each city = 922

4 0

3 years ago

Problem Ishaan is 2 times as old as Christopher. 35 years ago, Ishaan was 7 times as old as Christopher. How old is Ishaan now?

bekas [8.4K]

According to my math, he would be 90 years old

3 0

3 years ago

Read 2 more answers

1 At the annual hotdog eating contest, James eats 32 hotdogs in 60 seconds. At this rate, how long would it take James to eat 48

VLD [36.1K]

Answer:

90 seconds

Step-by-step explanation:

If James eats 32 hotdogs in 60 seconds, we want to find how long it would take James to eat 48 hotdogs.

We can use proportion to solve this problem.

If 32:60, then 48:x.

Since it will required more seconds to eat 48 hotdogs, 32 will divide.

If more, less divides.

Therefore

$x = \frac{48 \times 60}{32}$

$x = 90$

Therefore it will take James 90 seconds if he eats at the same rate

5 0

3 years ago

A square cement parking lot is being converted to a nature park. Each side of the parking lot is 100 meters long. The plan is to

irina [24]

Answer:

$A(t)=(100-8t)^{2}$

Step-by-step explanation:

Let

t-----> the number of years

A-----> the area of the cement parking lot

we know that

The function that represent this situation is

$A(t)=(100-8t)^{2}$

3 0

4 years ago