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3 years ago

Explain please hurry ASAP

Mathematics

1 answer:

Nuetrik [128]3 years ago

6 0

Answer:

x = 4

Step-by-step explanation:

we know that 72 and (2x + 10) add up to 90

90-72 = 18

(2x + 10) = 18

2x = 8

x = 4

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Solve the system of equations by substitution - 5x+8y= -86 <br>y=6x-43

n200080 [17]

Answer:

(6 ,-7)

Step-by-step explanation:

$- 5x + 8y = - 86 \\ y = 6x - 43 \\ - 5x = - 86 - 8y \\ x = 17.2 + 1.6y \\ y = 6(17.2 + 1.6y) - 43 \\ y = 103.2 + 9.6y - 43 \\ 8.6y = - 60.2 \\ y = - 7 \\$

$x = 17.2 + 1.6( - 7) \\ x = 17.2 - 11.2 \\ x = 6$

6 0

3 years ago

⚠⚠I SEE YOU DONT YOU DARE IGNORE THIS⚠⚠⚠⚠

hammer [34]

Answer:

2=(3,-2)

3=(-4.75,-6.25)

4=(5/2,3/2)

5=87.8(simplified)

3 0

3 years ago

Read 2 more answers

Suppose you have 20 coins that total $3.00. Some coins are nickels and some are quarters. Which of the following pairs of equati

shusha [124]

Answer: D. n + q = 20

5n + 25q = 300

Step-by-step explanation:

Let n represent the number of nickels that you have.

Let q represent the number of quarters that you have.

Suppose you have 20 coins. It means that

n + q = 20

The total value of the coins is $3. The value of a quarter is $0.25 and the value if a nickel is $0.05. Therefore, the equation would be

0.05n + 0.25q = 3

Multiplying both sides of the equation by 100, it becomes

5n + 25q = 300

The correct option is

D. n + q = 20

5n + 25q = 300

6 0

3 years ago

Find the value of x.<br> URGENT, please help!?

kotykmax [81]

Answer:

$x=\sqrt{30}$

Step-by-step explanation:

Use the geometric mean to solve for x. The side x is common to both the triangle that has the base of 3 and the triangle that has a base of 3 + 7, so x is the geometric mean. Set up that proportion as follows:

$\frac{3}{x}=\frac{x}{10}$ and