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3 years ago

PLEASE HELP, I'LL MARK BRAINLY (EASY)!

Mathematics

1 answer:

vfiekz [6]3 years ago

5 0

For 1. The answer is “x = 4”
Explanation: 5 X 4 = 20 and 4 - 3 = 1
By adding all equal sides together the sum is 42 so x is 4

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A train goes at a constant speed. If it covers 150 miles in 2/1 2 hours,

riadik2000 [5.3K]

Answer:

x =4.5 hours

Step-by-step explanation:

We can use ratios to solve

150 miles 270 miles

--------------- = --------------

2.5 hours x miles

150 *x = 270*2.5

Divide each side by 150

150x/150 = 270*2.5/150

x =4.5 hours

3 0

2 years ago

1. Represent real world problems

tekilochka [14]

160 feet long most likely

3 0

3 years ago

Prove that lines 3x-4y=12 and 3y=12-4x are perpendicular.

Svetllana [295]

Answer:

see explanation

Step-by-step explanation:

If 2 lines are perpendicular then the product of their slopes equals - 1

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Consider the given equations

3x - 4y = 12 ( subtract 3x from both sides )

- 4y = - 3x + 12 ( divide terms by - 4 )

y = $\frac{3}{4}$ x - 3 ← in slope- intercept form

with slope m = $\frac{3}{4}$

3y = 12 - 4x = - 4x + 12 ( divide terms by 3 )

y = - $\frac{4}{3}$ x + 4 ← in slope- intercept form

with slope m = - $\frac{4}{3}$

Then

$\frac{3}{4}$ × - $\frac{4}{3}$ = - 1

Since the product of their slopes = - 1 then the lines are perpendicular

3 0

2 years ago

Claire wants to start a stamp collection. She spends $15 on an album to hold her stamps and $1.25 for each stamp. If she has $40

enyata [817]

Answer:

Step-by-step explanation:

40 - 15 = 25

25/1.25=20

7 0

3 years ago

7. Given f(x) = 6(1 - x) +11, what is the value of f(8) ?

enot [183]

Answer:

f(8)=-31

Step-by-step explanation:

since 8 replaces x in f(x), x should be substituted as 8 in the expression. From there, after you substitute, it becomes 6(1-8)+11. Simplifying that expression is now 6(-7)+11. Multiply 6 and -7, you get -42. -42+11=-31. I hope this helps :)

6 0

2 years ago