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3 years ago

-Simplify the expression. 2(-y + 9) + 8y

Mathematics

1 answer:

Nata [24]3 years ago

4 0

Answer:

first we open the brackets using two so our new expression will be -2y+ 18 + 8y collect the like terms -2 y + 8 y + 18 so your final answer will be 6 y + 18 if you have any questions regarding this just ask

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What is 834% expressed as a fraction?

svetoff [14.1K]

Answer:

8.34/1

Step-by-step explanation:

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3 years ago

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a 60 foot tree casts a shadow 85ft long. the sine of the angle between the ground and the line that connects the tip of the shad

Jet001 [13]

The shadow to the top of the tree is 60 ft it all makes sense

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3 years ago

The line CD passes through the points C (2, -1) and D (1, 1). Which of the

inn [45]

Answer:

The equation of the straight line in point - slope form

y +1 = -2 ( x-2)

Step-by-step explanation:

Step(i):-

Given points are C( 2,-1) and D(1,1)

Slope of the line

$m = \frac{y_{2}-y_{1} }{x_{2}-x_{1} } = \frac{1-(-1)}{1-2} = \frac{2}{-1} = -2$

m = -2

Step(ii):-

Equation of the straight line passing through the point ( 2,-1) and having slope

m =-2

y - y₁ = m ( x- x₁)

y - (-1) = -2 ( x-2)

y +1 = -2 ( x-2)

Final answer:-

The equation of the straight line

y +1 = -2 ( x-2)

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2 years ago

The table shows the time Phillip spent driving and the number of miles he drove. He drove the same number of miles each hour.How

alexandr402 [8]

52 miles is the right question for this one!

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3 years ago

A genetic experiment with peas resulted in one sample of offspring that consisted of 414 green peas and 154 yellow peas. a. Cons

alekssr [168]

Answer: a. The interval in percentage is (23.46% , 30.76%)

b. No

Step-by-step explanation: To determine the confidence interval of a proportion, first find the percentage of yellow in that population:

phat = $\frac{154}{414+154}$

phat = 0.2711

The level α is 95%

1 - α = 0.05

α/2 = 0.025

As the population is bigger than 30, use z-test.

According to the table, z-score for α/2 = 0.025 is z = 1.96

The error for the interval is:

E = z. $\sqrt{\frac{phat(1-phat)}{n} }$

E = 1.96. $\sqrt{\frac{0.2711(1-0.2711)}{568} }$

E = 1.96*0.01865

E = 0.0365

The lower and higher limits of the interval are:

phat - E = 0.2711 - 0.0365 = 23.46%

phat + E = 0.2711 + 0.0365 = 30.76%

In conclusion, the 95% confidence interval to estimate the percentage of yellow is (23.46%,30.76%)

b. No, because 25% is inside the interval meaning that it doesn't contradict the expectations.

5 0

3 years ago