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riadik2000 [5.3K]
3 years ago
15

F(x) =3x^2 -8 find f(-4)

Mathematics
1 answer:
grin007 [14]3 years ago
3 0

Answer:

136

Step-by-step explanation:

plug in -4 in the x

f(-4)=3(-4)^2 - 8

f(-4)=-12^2 - 8

f(-4)=144-8

f(-4)=136

Done!

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Q3. In a hydraulic lift, a 1400 N force is applied to a 0.5 m2 piston. Calculate the minimum surface area of the large piston to
blondinia [14]

Answer:

1.8m^2 approx

Step-by-step explanation:

Given data

P1= 1400N

A1=0.5m^2

P2=5000 N

A2=??

Let us apply the formula to calculate the Area A2

P1/A1= P2/A2

substitute

1400/0.5= 5000/A2

cross multiply

1400*A2= 5000*0.5

1400*A2= 2500

A2= 2500/1400

A2= 1.78

Hence the Area is 1.8m^2 approx

3 0
3 years ago
4 ice cream cones cost $6. At this rate, how much do 7 ice cream cones cost?
satela [25.4K]

Answer:

$42

Step-by-step explanation:

Equation: y = 6x

x = number of ice cream cones

y = 6(7) = 42

5 0
3 years ago
Read 2 more answers
4. A number m is such that when it is divided by 30, 36, and 45 the remainder is always 7,
Bezzdna [24]

Answer:

187

Step-by-step explanation:

A number m is such that when it is divided by 30, 36 and 45 the remainder is always 7.

We should first find the LCM of 30, 36 and 45

We get that the LCM of the three numbers is 280 (working attached).

So now;

\frac{180}{30} = 6

\frac{180}{36} = 5

\frac{180}{45} = 4

But we need a number that leaves a remainder of 7 so we add 7 to 180 to get; 180 + 7 = 187.

5 0
3 years ago
Whats 3+3 for a prize~!<br>u&gt;
Vladimir [108]
3+3=6 hope this helps!
4 0
4 years ago
Read 2 more answers
Discounts: there are 125,000 American soldiers in Iraq . 25% are infantry. From the rest 40% are reservist. How many reservist a
Bond [772]
 there are 87350 reservist

7 0
3 years ago
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