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N76 [4]
3 years ago
15

After 15 years my age will be 4 times of present age what is my present age

Mathematics
2 answers:
scoray [572]3 years ago
8 0
X +15 = 4x

15 = 3x

x=5

Your present age is 5
timama [110]3 years ago
6 0
X - present age

x+15=4x\\
3x=15\\
x=5
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John got a 76, 68, and 83 on his first three test. What score does he need on his fourth test to achieve an 80 average?
shepuryov [24]
It's 93.
simple calculate it by:
(76+68+83+x)/4=80
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where x here is the grade needed to reach an av. of 80. 4 is the number of tests.
*common answer*
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3 years ago
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horrorfan [7]

Answer:

1: 3

Step-by-step explanation:

3:9

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borishaifa [10]

Answer:

7. x=3

8. l=11cm and w=7 cm

9. x-5\ge12

10. \frac{x}{3}\le15

Step-by-step explanation:

Question 7.

The given expression is:

12-3(2x+1)=7x-3(7+x)

Expand the parenthesis using the distributive property:

12-6x-3=7x-21-3x

Group similar terms:

-6x-7x+3x=-21+3-12

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Question 8:

Let the width of the rectangle be; w

The length of the rectangle is l=w+4

The perimeter is given as: P=2(l+w)

Given that the perimeter P=36, then:

36=2[(w+4)+w)]

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Divide both sides by 2:

\implies 18=2w+4

Subtract 4 from both sides:

\implies 18-4=2w

\implies 14=2w

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The dimensions of the rectangle is: w=7 cm and l=7+4=11cm

Question 9

Let the number be x.

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x-5\ge12

Question 10:

Let the number be x.

The quotient of a number and 3 is written as:

\frac{x}{3}

The quotient of a number and 3 is no more than 15 is written as;

\frac{x}{3}\le15

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3 years ago
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PtichkaEL [24]

Answer:

C

Step-by-step explanation:

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Answer:

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