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3 years ago

Pls help this is a test plss i need it

Mathematics

1 answer:

sashaice [31]3 years ago

5 0

Answer:

Step-by-step explanation:

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A high-speed train traveled 2200 miles in 10 hours without making any stops through the countryside of a rural area of southern

algol13

Speed = distance / time

speed = 2200/10
speed = 220 miles per hr

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3 years ago

Solve for x: 4(x-5) 8. = 9y

lora16 [44]

Answer:

X=18y+5

EXPLANATION

4(X-5)/8 =9Y

(4X-20)/8 =9Y

4X-20=9Y×8

4X=72Y+20

X=(72Y+20)/4

X=18Y+5

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2 years ago

Use single digits times a power of 10 to estimate the number 0.00005423

VashaNatasha [74]

Answer: 5.423 × 10^-5

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4 years ago

At a carry-out pizza restaurant, an order of 3 slices of pizza, 4 breadsticks, and 2 juice drinks costs $13.35. A second order o

BartSMP [9]

Answer: Pizza = $2.95, Breadstick = $0.50, Juice = $1.25

Step-by-step explanation:

Let P represent the cost of a slice of pizza

and B represent the cost of breadstick

and J represent the cost of a juice drink.

EQ1: 3P + 4B + 2J = 13.35

EQ2: 5P + 2B + 3J = 19.50

EQ3: 4B + J = P + 0.30 --> P - 4B - J = -0.30

Let's eliminate B from EQ1 and EQ2 to form EQ4:

3P + 4B + 2J = 13.35 → 1(3P + 4B + 2J = 13.35) → 3P + 4B + 2J = 13.35

5P + 2B + 3J = 19.50 → -2(5P + 2B + 3J = 19.50) → -10P - 4B - 6J = -39.00

EQ4: -7P -4J = -25.65

And eliminate B from EQ1 and EQ3 to form EQ5:

3P + 4B + 2J = 13.35

P - 4B - J = -0.30

EQ5: 4P + J = 13.05

Now, eliminate J from EQ4 and EQ5 to solve for P:

-7P - 4J = -25.65 → 1(-7P - 4J = -25.65) → -7P - 4J = -25.65

4P + J = 13.05 → 4(4P + J = 13.05) → 16P +4J = 52.20

9P = 26.55

÷9 ÷9

P = 2.95

Plug in P = 2.95 into EQ4 or EQ5 to solve for J:

EQ5: 4P + J = 13.05

4(2.95) + J = 13.05

11.80 + J = 13.05

J = 1.25

Plug in P = 2.95 and J = 1.25 into either EQ1 or EQ2 or EQ3 to solve for B:

EQ3: 4B + J = P + 0.30

4B + 1.25 = 2.95 + 0.30

4B + 1.25 = 3.25

4B = 2.00

B = 0.50

Check (since we used EQ3 to find B, use either EQ1 or EQ2):

EQ2: 5P + 2B + 3J = 19.50

5(2.95) + 2(0.50) + 3(1.25) = 19.50

14.75 + 1.00 + 3.75 = 19.50

19.50 = 19.50 $\checkmark$

6 0

3 years ago

What are the solutions of this quadratic equation? X2 − 10x = -34 A. X= -8, -2 B. X= 5 + 3i C. X= -5 + 3i D. X= -5 + square root

MakcuM [25]

Answer:

B. X= 5 + 3i

5 + 3i

Step-by-step explanation:

We are given the quadratic equation

x² - 10x = -34

x² - 10x + 34 = 0

Using Almighty formula

x = -b ± √b² - 4ac/2a

When given equation: ax² + bx + c

Where: a = 1, b = -10 , c = 34

x = -10 ± √-10² - 4 × 1 × 34/2 × 1

x = 10 ± √100 - 136/2

x = 10 ± √-36 /2

x = 10/2 ±. √-36/2

x = 5 ± 6i /2

x = 5 ± 3i

Hence: the roots of the equation are:

x = 5 - 3i , x = 5 + 3i

6 0

3 years ago