Answer:
4 minutes and 10 seconds.
Step-by-step explanation:
Time = Distance / Speed (or rate)
Time = 17.5 feet / 0.07 feet per second
Hence, time = 250 seconds.
250 seconds = 4 minutes 10 seconds.
We have an equation: 90/? = 120/100
Cross multiply:
120*? = 90*100
⇒ ? = 90*100/120 = 75.
He weighed 75 pounds in fourth grade~
Answer:
Step-by-step explanation:
Given
Required
Which ratio is incorrect
Each ratio is a conversion of 1 unit to the other.
Taking them one at a time.
The first is
--- The ratio is correct
The next is:
The conversion is correct; however the ratio is incorrect.
This is so because, the first ratio () has centimetre as the numerator
The next should have centimetre has its denominator in order to cancel out the units.
So, the correct ratio is:
Answer:
x = 1
Step-by-step explanation:
a^2 + b^2 = c^2
The hypotenuse (c) and a side length is already given, so:
x^2 + 12 = 13
x^2 = 1
Square root of 1 = 1
So, x = 1
You can check it by 1+12=13
Step-by-step explanation:
multiply the first equation by 5 and the second by 2
5(3x+2y=-7)
2(2x-5y=8)
15x+10y=-35
4x-10y=16
add them
19x=-19
divide both sides by 19
x=-1
bring the value of x in either equation 1 or 2
in 1
3(-1)+2y=-7
-3+2y=-7
2y=-7+3
2y=-4
divide both sides by 2
y=-2