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3 years ago

Can someone please answer this question?!!!!!!!!

Mathematics

1 answer:

Mashutka [201]3 years ago

8 0

Let's treat that one as a 4 by 8 rectangle with a 2 by 4 right triangle chopped out of the corner.

A = 4×8 - (1/2)×2×4 = 32 - 4 = 28

Answer: 28

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Everyone at camp takes turns being on lunch duty. You and your friend are in charge of making sandwiches. you both can make 1 sa

soldi70 [24.7K]

Answer To (b): 10 sandwiches in 20 minutes. But If Your Friend Arrived 10 Minutes Earlier, Then He Can Make 20 Sandwiches In The 20 Minutes That You Are There. If He Started When He Arrived And The Twenty Minutes Started Then, You Can Only Make 5.

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3 years ago

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An item is regularly priced at $70. Keiko bought it on sale for 80% off the regular price. How much did Keiko pay? $

pantera1 [17]

Answer:

$14

Step-by-step explanation:

80% of $70 is $14, saving him $56

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2 years ago

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Write down the quadratic equation whose roots are $x = -7$ and $x = 1,$ and the coefficient of $x^2$ is 1. Enter your answer in

pav-90 [236]

<h2>Steps:</h2>

So firstly, since we know that the coefficient of x² is 1, this means that this is our base equation:

y = x² + bx + c

Now, since we know that the roots are -7 and 1, set y = 0 and set x = -7 and 1 and simplify:

$0=(-7)^2+b(-7)+c\\0=49-7b+c\\-49=-7b+c\\\\0=1^2+b(1)+c\\0=1+b+c\\-1=b+c\\\\-49=-7b+c\\-1=b+c$

Now with this, we can set up a system of equations to solve for b and c. For this, I will be using the elimination method. For this, subtract the 2 equations:

$\begin{alignedat}{2}-49&=-7b+c\\-(-1&=b+c)\\-48&=-8b\end{alignedat}$

Now that the c variable has been eliminated we can solve for b. For this, divide both sides by -8 and your first part of your answer is b = 6.

Now that we know the value of b, plug it into either equation to solve for c:

$-49=-7(6)+c\\-49=-42+c\\-7=c\\\\-1=6+c\\-7=c$

<h2>Answer:</h2>

<u>Putting it together, your final answer is x² + 6x - 7 = 0.</u>

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3 years ago

What values are solutions of 0 =2xexponent of 2 -6x-8

Svetlanka [38]

Answer:

x = -1 and x = 4

Step-by-step explanation:

Firstly solve the quadratic expression of

2x^2-6x-8 = 0....it gives you the two brackets of.....(2x-8)(x+1)=0

then...you equate the two brackets to 0.separately

2x-8 = 0....which gives you...x = 4...as the first solution..then..;

x+1 = 0....which gives you...x = -1...as the second solution

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2 years ago

6a. In King County the sales tax is 9.5%. What is the total tax collected (tax ONLY) on a purchase of $222.00? I WILL GIVE YOU B

soldier1979 [14.2K]

Answer:

21.09

Step-by-step explanation:

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2 years ago