Answer:
3 and 4 are the only ones that are right angles.
Step-by-step explanation:
A^2+B^2=C^2
Answer:
150 cm/s
Step-by-step explanation:
We have that the area of a rectangle is as follows:
a = l * w
they ask us to change the increase in area with respect to time, therefore, if we derive with respect to t we are left with:
da / dt = w * (dl / d) t + l * (dw / dt)
From the statement we know that:
l = 20 cm
w = 15 cm
dl / dt = 6 cm / s
dw / dt = 3 cm / s
replacing each value we have:
da / dt = 15 * 6 + 20 * 3
da / dt = 150
Which means that 150 cm / s increases the area of the rectangle in relation to time
Using the distributive property you would multiply 15 by each term inside the parentheses:
15 times x = 15x
15 times 2 = 30
The equivalent expression would be 15x + 30
Following BODMAS,
start with the inner brackets first so, 36-5(21/8) + 27 .
Then you multiply: 36 - 105/8 + 27
Work from left to right: answer should be 399/8
Hope this helps :)
Can always check with calculator too XD