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3 years ago

Write an equation for the description. Ten times the sum of half a number x and 7 is 9.

Mathematics

1 answer:

tensa zangetsu [6.8K]3 years ago

7 0

Answer:

10( 1/2x + 7) = 9

Step-by-step explanation:

This is the answer because:

1) 10 times the sum is representing 10 multiplied by the sum of two numbers

2) The sum of half a number x and 7 is 1/2x + 7 because you have to figure out 1/2 of x first and then add it with 7

3) This whole entire expression is supposed to equal to 9, so the final answer is 10( 1/2x + 7) = 9

4) 1/2x + 7 is in parenthesis because you have to figure out the sum of those two number and then multiply it with 10

Hope this helps!

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The total length of the four pieces is 3.48 m so how many pieces do i need to buy to get 8m?

Crazy boy [7]

Answer:

10 pieces

Step-by-step explanation:

3.48÷4=0.87

0.87×10=8.7

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3 years ago

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3 years ago

The sum of all the digits of the integers from 18 to 21 inclusive is 24 (1+8 + 1+9 + 2+0 + 2+1 = 24). What is the sum of all the

blondinia [14]

Answer:

$R=900$

Step-by-step explanation:

You can add all the digits one by one, or count how many of each digit you have in total, for example: how many digits one are in the digits of the integers from 0 to 99:

First, the ones that are in the units: 1,11,21,31,41,51,61,72,81,91, there are 10 in total (not counting the digit one in the decimals in 11).

Then the ones that are in the decimals:

10,11,12,13,14,15,16,17,18,19 they are 10 in total (not counting the digit one in the units in 11).

This means they are 20 digit ones in total. And is the same for the twos, the threes, etc. The sum of all will be:

$R=20*1+20*2+20*3+20*4+20*5+20*6+20*7+20*8+20*9\\$

Factorizing:

$R=20(1+2+3+4+5+6+7+8+9)=20(45)=900$

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4 years ago

Solve system using eliminations<br> 2x+4y=22<br> 2x-2y=-8

KATRIN_1 [288]

$2x+4y=22 \\
2x-2y=-8 \ \ \ |\times (-1) \\ \\
2x+4y=22 \\
\underline{-2x+2y=8} \\
2x-2x+4y+2y=22+8 \\
6y=30 \ \ \ |\div 6 \\
y=5 \\ \\
2x-2y=-8 \\
2x-2 \times 5=-8 \\
2x-10=-8 \ \ \ |+10 \\
2x=2 \ \ \ |\div 2 \\
x=1 \\ \\
\boxed{(x,y)=(1,5)}$

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3 years ago

Find the lenght of the side of a square whose area is 441m square

Delvig [45]

Answer:

Step-by-step explanation:

Since its a square the all sides are the same so find the perfect square of the number 441 and thats your answer please put brainliest if this helps

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3 years ago

Read 2 more answers