It would be...C?? I'm not sure but I think it's right. Brainliest?
8 - 15 means subtract the positive number 15 from 8.
8 - 15 = 8 + (-15) = -7
8 - (-15) means subtract the negative number -15 from 8.
Subtracting a negative number is the same as adding a positive number.
8 - (-15) = 8 + 15 = 23
8 - 15 = -7, and 8 - (-15) = 23. The expressions mean different operations and have different answers.
Answer:
9B^2-12B+4
Step-by-step explanation:
use (a-b)^2 = a^2-2ab+b^2
(3B)^2 - 2x3B x 2 +2^2
raise a product to a power
9B^2-12B+4
Answer:
240°
Step-by-step explanation:
Draw a line EF perpendicular to AB and CD passing through M
In △BME
∠BME+∠MBE+∠BEM=180∘ (Angle sum proprerty)
∠BME+35∘+90∘=180∘∠BME=180∘−125∘∠BME=45∘
In △DMF
∠DMF+∠MDF+∠MFD=180∘ (Angle sum property )
∠DMF+75∘+90∘=180∘∠DMF=180∘−165∘∠DMF=15∘
x=∠DMF+∠BME+∠EMF
x=15∘+45∘+180∘x=240∘
Answer:
Step-by-step explanation:
- Speed of the boat = x
- Speed of the current = y
<u>Travel downstream, speed is:</u>
<u>Travel upstream, speed is:</u>
<u>Add up the equations:</u>
- x + y + x - y = 30 + 20
- 2x = 50
- x = 25
<u>Find y:</u>
Speed of the boat is 25 mph
Speed of the current is 5 mph
