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3 years ago

Help. Please. I need help.

Mathematics

1 answer:

malfutka [58]3 years ago

5 0

Answer:

C) 3x+20 < 50

Step-by-step explanation:

Since 50 is the limit as to what Mary wants to spend, the number on the left side should never be over 50, meaning that the total will be 'less' than 50

The 20 comes from how much she wants, meaning that 3x would be less than 10 dollars a gift.

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Q. Penelope is told to clean all the windows at her house. After cleaning 9 windows her job is

algol [13]

Answer:

Step-by-step explanation:

Proportions!

5 0

3 years ago

Read 2 more answers

A bird is attempting to fly northeast at a constant speed, but a wind blowing southward at 5 miles per

guajiro [1.7K]

Answer:

The value is $v_b = 9.89 \ miles /hour$

Step-by-step explanation:

From the question we are told that

The velocity of the wind southward is $v = 5 j \ miles / hour$

The resultant velocity of the bird with the with wind is $V= \sqrt{53}$

Generally for an object moving in the northwest direction the angle with the horizontal is 45°

Generally the velocity of the bird in the along the x -axis is

$V_x= v_b cos 45^o i$

Generally the velocity of the bird in the along the y -axis is

$V_y=(v_b sin 45^o - 5)j$

Here $v_b$ is the velocity of the bird without the wind

Generally the resultant velocity of the bird with the with wind is mathematically represented as

$V = \sqrt{V_x^2 + V_y^2 }$

=> $\sqrt{53} = \sqrt{(v_b cos 45^o)^2 + (v_b sin 45^o - 5)^2 }$

Generally

$sin 45^o = \frac{1}{\sqrt{2} }$

and

$cos 45^o = \frac{1}{\sqrt{2} }$

$\sqrt{53} = \sqrt{(v_b* (\frac{1}{\sqrt{2} ))^2 + ([v_b * (\frac{1}{\sqrt{2} ) ]- 5)^2 }$

=> $53 = \frac{1}{2} v_b^2 + \frac{1}{2} v_b^2 + 5^2 -2*5 * \frac{1}{\sqrt{2} } v_b$

=> $53 = v_b^2 + 25 - 5 \sqrt{2} v_b$

=> $v_b^2 - 5 \sqrt{2} v_b -28 = 0$

Solving the above quadratic equation using quadratic formula we obtain that

$v_b = 9.89 \ miles /hour$

The other value is negative so we do not make use of it because we know that the bird is moving in the positive x and y axis

7 0

4 years ago

Mikel gave a $1.32 tip for an order that cost $8.80

notsponge [240]

Answer:

1. Proportional

2. Not proportional

3. Not proportional

Step-by-step explanation:

Let's see what percentage of the $8.80 order is the $1.32 tip.

To find what percent a p[art is of a whole, divide the part by the whole and multiply by 100%.

$1.32/$8.80 * 100% = 15%

Mike's tip was $15% of the total.

1. $2.22 tip on $14.80 order

15% of $14.80 = 0.15 * $14.80 = $2.22

Tip is proportional

2. $1.86 tip on $10.50 order

15% of $10.50 = 0.15 * $10.50 = $1.58

Tip is nor proportional

3. Same as option 2 above.

7 0

3 years ago

Pleaseeee help me i have very little time

VashaNatasha [74]

Answer:

212 feet

Step-by-step explanation:

Please let me know if you want me to add an explanation as to why this is the answer. I can definitely do that, I just wouldn’t want to write it if you don’t want me to :)

7 0

3 years ago

Plz, help I beg you to answer this correctly there are 3 answers worth 10 points if you answer it correct I will give brainlyest

Dmitry_Shevchenko [17]

Answer:

2. 5(b+3)

3. 5b + 15

4. 15 + 5b

Step-by-step explanation:

area of rectangle = length * breadth

length= b+3

breadth = 5

3 0

3 years ago