**Answer:**

C

**Step-by-step explanation:**

"At least 75" means Erin needs a score that is 75 <u>or more</u>. Her score should be equal to or greater than 75.

The number line that shows this is C because the point at 75 is filled in (showing that 75 is included), and the ray (arrow) extends to the right indicating numbers larger than 75.

**Answer:**

The first one: Kilo-liters to milliliters.

When converting on the metric table, always remember:

Converting from larger to smaller you multiply. Converting from smaller to larger, you divide.

**Step-by-step explanation:**

A variable on both sides a fractional coefficient on the left side and fraction on the right side. it should be 40

**Answer:**

24 and 32

**Step-by-step explanation:**

Let their present ages be x and y

Therefore, x

we have 4x = 3y

4x - 3y = 0......................(I)

After four years,

we have, 9(x + 4) = 7(y + 4)

9x + 36 = 7y + 28

9x - 7y = -8 ........................(ii)

Solving (I) and (ii) simultaneously

4x - 3y = 0

9x - 7y = -8

multiply eqn I by 9 and equation (ii) by 4 and subtract result

36x - 27y = 0...............(iii)

36x - 28y = -32...........(iv)

subtracting (iv) from (iii) we have,

y = 32

substituting y back in equation (I)

4x - 3y = 0

4x -3(32) = 0

4x - 96 = 0

4x = 96

x = 24

Their ages are 24 and 32

Answer:

Step-by-step explanation:

x = 61⁰

Reason: x + 29⁰ = 90⁰ ( right angles i.e the angles are perpendicular to one another)

x = 90⁰ - 29⁰

x = 61⁰