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3 years ago

4. 3x - y = 7 2x + y = 8

Mathematics

1 answer:

Novay_Z [31]3 years ago

5 0

Answer: (x,y) = (3,2)

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A company does research on their product and finds that three-fifths of people who try the product, use it again. If 400 people

frozen [14]

3/5 of 400=x people used it
so we x=400x3/5
x=240
so 240 people used it again.

7 0

3 years ago

I need help!!!! I don’t understand these well and I have to do 5 of these.

butalik [34]

I believe it would be b

7 0

3 years ago

Jimmy's backyard is rectangle that is 18 5/6 yards long and 10 2/5 yards wide Jim buy sod in pieces that are 1 1/3 yard long and

g100num [7]

Answer:

111 pieces of soda

Step-by-step explanation:

step 1

Find the area of the rectangular backyard

The area of the rectangular backyard is equal to

$A=LW$

where

$L=18\frac{5}{6}\ yd=\frac{18*6+5}{6}=\frac{113}{6}\ yd$

$W=10\frac{2}{5}\ yd=\frac{10*5+2}{5}=\frac{52}{5}\ yd$

substitute

$A=(\frac{113}{6})(\frac{52}{5})$

$A=\frac{5,876}{30}\ yd^2$

step 2

Find the area of one piece of sod

The area of the rectangular piece of sod is

$A=LW$

where

$L=1\frac{1}{3}\ yd=\frac{1*3+1}{3}=\frac{4}{3}\ yd$

$W=1\frac{1}{3}\ yd=\frac{1*3+1}{3}=\frac{4}{3}\ yd$

substitute

$A=(\frac{4}{3})^2\\\\A=\frac{16}{9}\ yd^2$

step 3

Find the pieces of sod needed

To find out how many whole pieces of sod will Jim need to buy to cover his backyard, divide the area of the backyard by the area of one piece of soda

$\frac{5,876}{30} : \frac{16}{9}=\frac{52,884}{480}=110.175$

Round up

111 pieces of soda

8 0

3 years ago

What is 75.62-72.28=??

svetlana [45]

It's 75.62-72.28=3.34

6 0

3 years ago

Read 2 more answers

Indicate the method you would use to prove the two 's . If no method applies, enter "none".

LenKa [72]

The simpliest way is to use the AAS Postulate.

AAS Postulate: If two angles and the non-included side of one triangle are equal to the corresponding angles and side of another triangle, the triangles are congruent.

From the diagram you have:

1. one pair of angles with measure 40°;

2. one pair of angles with measure 60°;

3. the non-included side of one triangle is congruent to the non-included side of another triangle (their lengths are 10).

Answer: correct choice is D (AAS)

4 0

4 years ago