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brilliants [131]
4 years ago
13

What is 0.7 times x = 21

Mathematics
2 answers:
guapka [62]4 years ago
6 0

Answer:

x=30

Step-by-step explanation:

0.7x=21

x=21/0.7

x=30

Novay_Z [31]4 years ago
6 0

Answer:

30

Step-by-step explanation:

First we have to set up the equation

0.7x = 21

then to isolate x by itself you have to divide by 0.7

(0.7x)/(0.7)= (21)/(0.7)

The left side cancels and then 21/.07 = 30

Plz mark me as brainliest ty

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Gabriel saves 40% of his monthly pay check for collage. He earned $270 last month. How much money did Gabriel save for collage
Ivan
Hi there!

I do not know the other values of the pay check, so I will explain to you how to solve for 40% of the 270 dollars. To solve, we'll need to set up a proportion. That proportion is 40/100 = x/270. Next, we need to cross-multiply: 100x = 10800. Lastly, we'll divide to figure out what 40% of 270 is. x = 108.

Hope this helps!! :)
If there's anything else that I can help you with, please let me know!
4 0
4 years ago
In a parallelogram whose area is 15, the base is represented by x+7 and the altitude x-7. Find the base of parallelogram.
Sati [7]
Area = (base)*(height)
15 = (x+7)(x-7)
(x+7)(x-7) = 15
x^2 - 49 = 15
x^2 - 49+49 = 15+49
x^2 = 64
sqrt(x^2) = sqrt(64)
x = 8 ... note that x can't be negative

If x = 8, then the base is...
x+7 = 8+7 = 15

Therefore the base is 15 units. 
(the height is x-7 = 8-7 = 1 unit)

7 0
3 years ago
Write 0.001574 in scientific notation
love history [14]

Answer: 1.574 × 10-3

Step-by-step explanation:

To convert 0.001574 into scientific notation, follow these steps:

Move the decimal 3 times to right in the number so that the resulting number, m = 1.574, is greater than or equal to 1 but less than 10

Since we moved the decimal to the right the exponent n is negative

n = -3

Write in the scientific notation form, m × 10n

= 1.574 × 10-3

3 0
3 years ago
Read 2 more answers
Mark is making a decoration for a rally, using a string of triangular strips. Each strip is an isosceles triangle when flattened
jeyben [28]

Solution:

Consider the Given Isosceles Triangle

Considering the Possibilities

Case 1. When two equal angles are of 70°

 Let the third angle be x.

Keeping in mind , that sum of Interior angles of Triangle is 180°.

70° + 70° + x= 180°

140° +x= 180°

x= 180°- 140°

x= 40°

Case 2:

When an angle measures 70°, and two equal angles measure x°.

Keeping the same property of triangle in mind, that is sum of interior angles of triangle is 180°.

70° + x° + x° = 180°

⇒  70° + 2 x° = 180°

⇒ 2 x° = 180° -  70°

⇒ 2 x° = 110°

Dividing both sides by 2, we get

x= 55°


5 0
3 years ago
Find the value of x and y.
Scorpion4ik [409]

Answer:

x = 9.9

y= 11

Step-by-step explanation:

using sin(45)21 = 29.698

3x = 29.698. Divide both sides by 3

x = 9.899. Round to 9.9

In a Right triangle with 45° angles, the legs of the 90° angle are equal. Given 21,

to find the value of y, the equation is

2y -1 = 21. Add 1 to both sides

2y = 22. Divide both sides by 2

y = 11

8 0
3 years ago
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