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3 years ago

D+16 for d=-18 Your answer

Mathematics

1 answer:

AlladinOne [14]3 years ago

4 0

-18 + 16 = -2
——————-

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A boy is 20 years old at present. How old was he 3 years ago?

EleoNora [17]

Answer: seven-teen

Step-by-step explanation:twenty minus three

3 0

3 years ago

Write an equation for the line passing through the points (-5,15) and (20,25). Show how you found your answer.

olasank [31]

The point-slope form:

$y-y_1=m(x-x_1)\\\\m=\dfrac{y_2-y_1}{x_2-x_1}$

We have the points (-5, 15) and (20, 25). substitute:

$m=\dfrac{25-15}{20-(-5)}=\dfrac{10}{25}=\dfrac{2}{5}\\\\y-15=\dfrac{2}{5}(x-(-5))\\\\y-15=\dfrac{2}{5}(x+5)\qquad|\text{use distributive property}\\\\y-15=\dfrac{2}{5}x+2\qquad|\text{add 15 from both sides}\\\\y=\dfrac{2}{5}x+17\qquad|\text{multiply both sides by 5}\\\\5y=2x+85\qquad|\text{subtract 2x from both sides}\\\\-2x+5y=85\qquad|\text{change the signs}\\\\2x-5y=-85$

Answer:

point-slope form: $y-15=\dfrac{2}{5}(x+5)$

slope-intercept form: $y=\dfrac{2}{5}x+17$

standard form: $2x-5y=-85$

7 0

4 years ago

Dave delivered 52 newspapers all together on Saturday and Sunday. He delivered 8 more newspapers on Sunday than on Saturday. How

Harman [31]

Let x=papers on Saturday and y=papers on Sunday

First make equations for the information given to you

x+y=52 (total papers) and y= x+8 (he sold 8 more on Sunday)

then since you know y=x+8 then substitute it in the other equation like so

x+(x+8)=52 which means 2x+8=52 which means 2x=44 and therefore x=22

the problem however asks for sunday and not saturday, so solve for y now

y=x+8 which means y=22+8 which means y=30

He sold 30 papers on Sunday

4 0

3 years ago

Help thanks for brainliest btw

erik [133]

Answer:

b and and think 4

Step-by-step explanation:

6 0

3 years ago

What is the 2x+4=20 x=

marysya [2.9K]

Answer:

Step-by-step explanation:

x=8

Use reverse equations

20-4=16

16÷2=8

3 0

3 years ago