All categories

2 years ago

Help fast plsssssssssss

Mathematics

2 answers:

Vilka [71]2 years ago

8 0

Answer:

- and -. =+ so-9+12=3

Step-by-step explanation:

the minus changes to plus and then we solve

bearhunter [10]2 years ago

4 0

-9-(-12)=-9+12=3
-9-12=-9+(-12)=-21

You might be interested in

Two integers, a and b, have a product of 24. What is the least possible sum of a and b?

rjkz [21]

The least possible sum is 10.

The pairs of factors for 24 are (1,24), (2,12), (3,8), (4,6) with sums 25, 14, 11, 10. So the numbers are 4 and 6.

6+4

7 0

2 years ago

Gravel is being dumped from a conveyor belt at a rate of 20 ft3 /min and its coarseness is such that it forms a pile in the shap

pantera1 [17]

Answer:

The height of the pile is increasing at the rate of $\mathbf{ \dfrac{20}{56.25 \pi} \ \ \ \ \ ft/min}$

Step-by-step explanation:

Given that :

Gravel is being dumped from a conveyor belt at a rate of 20 ft³ /min

i.e $\dfrac{dV}{dt}= 20 \ ft^3/min$

we know that radius r is always twice the diameter d

i.e d = 2r

Given that :

the shape of a cone whose base diameter and height are always equal.

then d = h = 2r

h = 2r

r = h/2

The volume of a cone can be given by the formula:

$V = \dfrac{\pi r^2 h}{3}$

$V = \dfrac{\pi (h/2)^2 h}{3}$

$V = \dfrac{1}{12} \pi h^3$

$V = \dfrac{ \pi h^3}{12}$

Taking the differentiation of volume V with respect to time t; we have:

$\dfrac{dV}{dt }= (\dfrac{d}{dh}(\dfrac{\pi h^3}{12})) \times \dfrac{dh}{dt}$

$\dfrac{dV}{dt }= (\dfrac{\pi h^2}{4} ) \times \dfrac{dh}{dt}$

we know that:

$\dfrac{dV}{dt}= 20 \ ft^3/min$

So;we have:

$20= (\dfrac{\pi (15)^2}{4} ) \times \dfrac{dh}{dt}$

$20= 56.25 \pi \times \dfrac{dh}{dt}$

$\mathbf{\dfrac{dh}{dt}= \dfrac{20}{56.25 \pi} \ \ \ \ \ ft/min}$

The height of the pile is increasing at the rate of $\mathbf{ \dfrac{20}{56.25 \pi} \ \ \ \ \ ft/min}$

8 0

2 years ago

Can you help me with this. Find the surface area

ruslelena [56]

Answer:

2370 cm²

Step-by-step explanation:

2(32·15+15·15+15·32) = 2370

4 0

2 years ago

Pepper Jackie has 7.5 bags of mulch to cover 12 yds squared 2 of edible flower beds. If she wants to distribute the mulch evenly

anyanavicka [17]

Answer:

$\frac{5}{8}$

Step-by-step explanation:

Data provided in the question

Number of bags of mulch = 7.5 bags

Number of square yards = 12

So by considering above information, we could find the number of bags for each square yard is

= $\frac{Number\ of\ bags\ of\ mulch }{Number\ of\ square\ yards }$

= $\frac{7.5}{12}$

= 0.625

The 0.625 is equal to $\frac{5}{8}$ bag

Therefore, she need to use $\frac{5}{8}$ bag for each square yard

Basically we use the fraction so that each square yard for use of bag could be find out

3 0

2 years ago

Read 2 more answers

A dice is thrown once. What is the probability of getting:-

Anvisha [2.4K]

Answer:

Step-by-step explanation:

4 0

2 years ago