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3 years ago

HELP PLEASE I NEED HELPPPP

Mathematics

1 answer:

nlexa [21]3 years ago

3 0

Answer:

174 inches squared

Step-by-step explanation:

First, we have to remember what the area of a triangle is:

$\frac{base*height}{2}$

Since there are 4 of the same triangle, multiply the area of one triangle by 4:

$\frac{10*8.7}{2}$

$\frac{87}{2}$

$43.5$

$43.5(4)=174$

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The original price of a jacket is $130. The discount is 40%. Find the sale price.

lisov135 [29]

Answer:

78$

Step-by-step explanation:

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5 0

3 years ago

Read 2 more answers

What are the values of x in the equation 4x2 4x – 3 = 0? x = –1.5, 0.5 x = –0.5, –1.5 x = x =?

Stolb23 [73]

Answer:

The values of x are

$x=-1.5\ , 0.5$

Step-by-step explanation:

we have

$4x^{2}+4x-3=0$

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$4x^{2}+4x=3$

Factor the leading coefficient

$4(x^{2}+x)=3$

Complete the square. Remember to balance the equation by adding the same constants to each side.

$4(x^{2}+x+.25)=3+1$

$4(x^{2}+x+.25)=4$

$(x^{2}+x+.25)=1$

Rewrite as perfect squares

$(x+0.5)^{2}=1$

Square root both sides

$x+0.5=(+/-)1$

$x=-0.5(+/-)1$

$x=-0.5+1=0.5$

$x=-0.5-1=-1.5$

3 0

4 years ago

Read 2 more answers

A bank is investigating ways to entice customers to charge more on their credit cards. (Banks earn a fee from the merchant on ea

MAVERICK [17]

Answer:

$CI = (\bar{x_{1} } - \bar{x_{2}} ) \pm MoE\\\\$

$CI = (527 - 439) \pm 25.75\\\\CI = 88 \pm 25.75\\\\CI = 88 - 25.75 \:\: and \:\: 88 + 25.75\\\\CI = (62.2 \: ,\: 113.8 )$

The correct answer choice is a. (62.2, 113.8)

Step-by-step explanation:

Of the 500 customers who were told the increase applied to charges above $1000 each month, the average increase in spending was $527 with a standard deviation of $225.

Sample size = n₁ = 500

Sample mean = x₁ = $527

Standard deviation = s₁ = $225

Of the 500 customers who were told the increase applied to charges above $2000 each month, the average increase in spending was $439 with a standard deviation of $189

Sample size = n₂ = 500

Sample mean = x₂ = $439

Standard deviation = s₂ = $189

We are asked to find the 95% confidence interval for the difference between two means.

The given group of answer choices are

a. (62.2, 113.8)

b. (86.2, 120.5)

c. (10.3, 23.8)

d. (55.6, 67.8)

The confidence interval for the difference between two means is given by

$CI = (\bar{x_{1} } - \bar{x_{2}} ) \pm MoE\\\\$

Where $\bar{x_{1} }$ and $\bar{x_{2} }$ are the given sample means and margin of error is given by