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2 years ago

The square of a non-zero number is equal to 70% of the original number. What

Mathematics

1 answer:

aleksandr82 [10.1K]2 years ago

3 0

Answer:

0.7.

Step-by-step explanation:

x^2 = 0.7x

x^2 - 0.7x = 0

x(x - 0.7) = 0

x = 0, 0.7.

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Answers for both boxes please

andre [41]

Step-by-step explanation:

4x + y = 6 => 8x + 2y = 12.

8x + 2y = 12

+ (-5x - 2y = -3)

=> 3x = 9, x = 3.

Therefore 4(3) + y = 6, 12 + y = 6, y = -6.

The solutions are x = 3 and y = -6.

6 0

3 years ago

1.The angle of elevation of a jet plane from a point R on the ground is 60°. After a flight of

egoroff_w [7]

Answer:

Diagram is not so perfect

OR = distance travelled by the jet plane.

Step-by-step explanation:

Let point J be the jet plane and OJ be the constant height at jet plane is flying and OR be the distance jet plane is travelling.

h =

$1700 \sqrt{3}$

Now,

From the figure i drew (1st)

taking 60 as reference angle,

tan60° = p/b

or,

$tan60 = 1700 \sqrt{3} \div b$

$b \: = 1700 \sqrt{3} \div tan60$

so, b = 1700m

inital distance = 1.7km(OR)

now,

tan 30 = p/b

$tan30 = 1700 \sqrt{3} \div b \\ or \: b = 1700 \sqrt{3} \div tan30$

so, b = 5100 m

so, final distance = 5.1 km(OR)

Now,

distance travelled = final distance - initial distance

distance travelled = 5.1 km - 1.7km

distance travlled = 3.4 km

Now,

time = 17 seconds

= 0.00472 hour.

Now,

speed = d/t

or, speed = 3.4/0.00472

so, speed = 720.3389km/hr

so, speed = 720 km/hr approximately

5 0

2 years ago

A number increased by 5

mrs_skeptik [129]

Answer:

if number was represented by x it would be x+5

Step-by-step explanation:

7 0

3 years ago

The ratio of the number of girls to the number of all students in the class is 4 to 9. Can there be 20 students in that class?

Masteriza [31]

Answer:

Step-by-step explanation:

20 ÷ 9 = 2.222222222
9 does not go evenly into 20, and there can't be a fraction of a student, so the answer is no.

I hope this helps!

3 0

3 years ago

Someone please help me ❤️

abruzzese [7]

Answer:

week 5!

Step-by-step explanation:

5 0

4 years ago

Read 2 more answers