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Vera_Pavlovna [14]
3 years ago
11

David has a piece of wood that is 7.28 meters long. He needs 4 pieces of wood that are each 1.75 meters long. If he cuts the woo

d he has into 4 equal pieces, will each piece be long enough?
Mathematics
1 answer:
Tema [17]3 years ago
5 0

9514 1404 393

Answer:

  yes

Step-by-step explanation:

You can go at this a couple of ways:

1. The total length David needs is (1.75 m) × 4 = 7.00 m. His 7.28 m piece is long enough to provide the pieces he needs.

__

2. The length of each piece when the wood is cut into quarters is ...

  (7.28 m)/4 = 1.82 m

This is longer than the 1.75 m needed, so each piece is long enough.

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If cos x = sin(20 + x) ° and 0°
Varvara68 [4.7K]

Answer:

x = 35°

Step-by-step explanation:

The question is as following

cos x = sin(20 + x)°  and  0° < x  < 90°  ,   find X?

==============================================

cos x = sin(20 + x)°

sin and cos are co-functions,

which means that: cos x = cos [90 - (20 + x)]

∴ x = 70 - x

∴ 2x = 70

∴ x = 35°

======================

Note: cos θ = sin ( 90 - θ )

4 0
3 years ago
Today the price of a new cell phone is $129 in 2000 the price of a similar cell phone was $240 what is the percent of the change
netineya [11]

Answer:

46.25% is the percent of the change in the price of a cell phone from 2000 to today.

Step-by-step explanation:

Cost of a cell phone in the year of 2000. C= $240

Cost of a same cell phone today, C'= $129

The percent of the change in price:

\frac{C-C'}{C}\times 100:

\frac{\$240-\$129}{\$240}\times 100=46.25\%

46.25% is the percentage of the change in the price of a cell phone from 2000 to today.

5 0
3 years ago
Someone help me with this question please I don’t know
ra1l [238]

The magic of the internet will help!

6 0
3 years ago
What’s 1 fourth of 1490
Kazeer [188]
1490/4 =372.5................
4 0
3 years ago
Read 2 more answers
Billie solved the equation below by completing the square, but she got the incorrect solution. In which step did Billie first ma
Tanzania [10]

Answer:

step 2

Step-by-step explanation:

we have

x^{2} +10x-49=0 ---> given problem

step 1

Move the constant to the right side

x^{2} +10x=49

the step 1 is correct

step 2

Complete the square

x^{2} +10x+5^2=49+5^2

x^{2} +10x+5^2=74

<u><em>The step 2 is not correct</em></u>

step 3

Rewrite as perfect squares

(x+5)^{2}=74

step 4

take square root both sides

x+5=\pm\sqrt{74}

step 5

Find the values of x

x=-5\pm\sqrt{74}

x=-5+\sqrt{74}

x=-5-\sqrt{74}

5 0
4 years ago
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