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Elis [28]
3 years ago
7

Simplify. 3(x + 4) please

Mathematics
1 answer:
Sveta_85 [38]3 years ago
6 0

Answer:

3 x + 12

Step-by-step explanation:

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High grade steel consists of 85% iron and 15% magnese. Low grade steel consists of 67% iron and 33% mag ese. NASA orders 500 ton
Mamont248 [21]

Answer:

361\dfrac{1}{9} tons of high steel and 138\dfrac{8}{9} tons of low steel

Step-by-step explanation:

Let x be the number of tons of high grade steel and y be the number of tons ow low grade steel needed.

In x tons of high grade steel there are

0.85x tons of iron

0.15x tons of magnese

In y tons of low grade steel there are

0.67y tons of iron

0.33y tons of magnese

NASA orders 500 tons of steel, so

x+y=500

and specifies that it must be in the proportion 80% iron and 20% magnese, so

0.85x+0.67y=500\cdot 0.8\\ \\0.85x+0.67y=400

From the first equation,

x=500-y

Substitute it into the second equation:

0.85(500-y)+0.67y=400\\ \\425-0.85y+0.67y=400\\ \\-0.18y=-25\\ \\y=\dfrac{2,500}{18}=138\dfrac{8}{9}\ tons\\ \\x=361\dfrac{1}{9}\ tons

7 0
3 years ago
Help pls and ty :D !!​
xxMikexx [17]

Try this suggested option, answers are marked with colour.

4 0
2 years ago
Simplify the ratio 24/56
Brrunno [24]
How to solve:
Step 1 :  Note down the given ratio from the questions.

Step 2 :  <span>Find the greatest common factor, and divide the numerator and denominator by that value.
Answer: 3:7</span>
7 0
3 years ago
The length of a rectangle is 12 inches more than its width. The perimeter is 280 inches. Find the length and the width of the re
miss Akunina [59]
Use the equation p=2l+2w and sub everything in to get 280=2l+2(l+12).
distribute the 2 for 280=2l+2l+24.
add/subtract like terms over, leaving you with 256=4l.
divide the 4 from 256, resulting in l=64.
since w=l+12, add 12 to 64 to find that w=76.
basically, l=64 and w=76.
hope this helps!
6 0
3 years ago
Read 2 more answers
Please answer correctly !!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!
Crank

Answer:

4:3

Step-by-step explanation:

16:12=8:6=4:3

6 0
3 years ago
Read 2 more answers
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