Mathematics, 14.07.2020 01:01 crybaby222psyc

I need to solve these problems. Plz solve theses problems ASAP.

Answers: 2

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Answer from: shawn423

Step-by-step explanation:

Let's start with the first problem :

Dora spent 1/3 of her money and it equals 72 Jack spen 1/4 and had the amount left

To get the initial amount that Dora had we must multliply 72 by 3 since she spent 1/3 and 3 is the total number of parts

72*3=216 ⇒ Dora had 216 she spent 72 so : 216-72=144 ⇒144 is the amount left for her and Jack

Jack spent 1/4 of his total amount and had 144 left

144 is 3/4 to get 1/4 we must divide 144 by 3 ⇒ 144/3=48 so the total amount is 48*4=192

Let's check : 192-48= 144 so it's right

Jack spent 48

The second question :

We notice that the total area A is the sum of the white square's area and the blue region's area

A= 65+ x x is the area of the white square so x = 4*4 since it is 4cm*4cm so A= 65+16= 81 we khow that the area of a square is the lenght times itself so 81 = y² with y the lenght of the large blue square and y≥0 since it is a distance y= $\sqrt{81}$ = 9 so the lenght is 9 cm

The third problem :

Mo gave alex some stickers and now he has twice as many as Mo Mo had 150 and Alex 207 so let x be the amount of stickers we are locking for then : 207 +x = 2(150-x) 207+x = 300-2x 207 +3x = 300 3x = 300-207 ⇒93= 3x ⇒ x= 31

Let's check : 150-31 = 119 119*2= 238

207 + 31 = 238 that's right

so mo gave 31 stickers to alex

Answer from: navyaseth620

1. £48.

2. 9 centimetres.

3. 31 stickers.

Step-by-step explanation:

1. Since Dora spent 1/3 of her money, we can set up an equation to find out how much money she has in total.

1/3D = £72.

1/3 * 3D = £72 * 3

D = £216.

That means that Dora had £216, but then spent £72. 216 - 72 = £144. So, Dora has £144 left.

Since both people have the same amount left, and Jack spent 1/4 of his money, we can set up an equation.

3/4J = £144

(4/3)(3/4)J = 144(4/3)

J = £192.

That means that Jack had £192, but he spent it all until he only had £144 left. The amount that he spent was 192 - 144 = £48.

2. First, we can solve for the area of the inner white square. 4 * 4 = 16. The area of the white square is 16 centimetres squared.

Add that to the blue region, and you can get the area of the entire square. 65 + 16 = 81.

To find the area of a square, you do side length times side length. So, to find the side length from an area, you do the square root of the area. sqrt(81) = sqrt(9 * 9) = 9.

The length of the large blue square is 9 centimetres.

3. To start, a = 207 stickers and m = 150 stickers. x = the amount of stickers given to Alex.

a + x = 2(m - x)

207 + x = 2 * 150 - 2x

207 + x = 300 - 2x

x + 2x = 300 - 207

3x = 93

x = 31

So, Mo gave Alex 31 stickers.

Hope this helps!!

Answer from: Quest

the system of inequity is

$y\leq -x+4$

$3y> x$

step-by-step explanation:

from the given graph it is noticed that we have two related lines. one is solid and another is dashed.

if a line passing through two points, then the equation of line is

$y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)$

the solid line passing through the points (0,4) and (4,0).

$y-4=\frac{0-4}{4-0}(x-0)$

$y=-x+4$

the related equation of solid line is $y=-x+4$ .

similarly, find the related equation of dashed line. the dashed liune passing through the points (0,0) and (3,1).

$y-0=\frac{0-1}{3-0}(x-0)$

$3y=x$

the related equation of dashed line is $3y=x$

from the given graph it is noticed that the point (0,1) lies on the shaded region, therefore the point (0,1) must be satisfied by the related equations.

check the related equations by the point (0,1).

$1=-0+4$

$1=4$

this statement is true if the sign of inequality is < instead of equality. since it is an solid line therefore the sign of inequality will be $\leq$ . the required inequality is

$y\leq -x+4$

similarly, check the second related equation.

$3(1)=0$

it is a dashed line, so this statement is true if the sign of inequality is > . the required inequality is

$3y> x$

15 points write a system of inequalities to represent the shaded portion of the graph

Answer from: Quest

i dont know sorry

step-by-step explanation:

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