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3 years ago

Evaluate –9x - 8 When x = -4

Mathematics

2 answers:

Paha777 [63]3 years ago

6 0

Answer: 28

Step-by-step explanation:

Given -9x - 8

if x=-4

Then -9(-4) - 8

negative 9 times negative 4 is positive 36.

36-8=28

Elan Coil [88]3 years ago

3 0

Answer:

Step-by-step explanation:

-9 x -4 the negitives cancel out making 9x4 = 36

36-8 = 27

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Rajan needs 1 liter of 15% hydrochloric acid solution for an experiment. He checks his storage cabinet, but he only has a 5-lite

yarga [219]

Answer:

Rajan must use 0.75 liters of 5% hydrochloric acid solution and 0.25 liters of 45% hydrochloric acid solution.

Step-by-step explanation:

Let us assume that, x liters of the 5% hydrochloric acid and y liters of the 45% hydrochloric acid solutions are combined.

As Rajan need total of 1 liter of solution, so

$x+y=1$

i.e $x=1-y$ --------------------1

As Rajan needs 5% hydrochloric acid and 45% hydrochloric acid to make a 1 liter batch of 15% hydrochloric acid, hence acid content of the mixture of two acids will be same as of the final one, so

$0.05x+0.45y=1\times 0.15$

i.e $5x+45y=15$ -------------2

Putting value of x from equation 1 in equation 2,

$\Rightarrow 5(1-y)+45y=15$

$\Rightarrow 5-5y+45y=15$

$\Rightarrow 5+40y=15$

$\Rightarrow 40y=15-5=10$

$\Rightarrow y=0.25$

Putting the value of y in equation 1,

$x=1-0.25=0.75$

Therefore, Rajan must use 0.75 liters of 5% hydrochloric acid solution and 0.25 liters of 45% hydrochloric acid solution.

5 0

3 years ago

Leah has $4.35 in her pocket in nickels and dimes. The number of dimes is 2 less than 3 times the number of nickels. How many of

Maksim231197 [3]

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6 0

3 years ago

Read 2 more answers

A line passes through the points (1, 3) and (3, -1) on a coordinate plane. What is the equation of this line in slope-intercept

FromTheMoon [43]

Answer:

y=[-2]x[+][5]

Step-by-step explanation:

$\frac{-1-3}{3-1}=\frac{-4}{2} =-2$ m= -2