Make a long-distance call from a to B, and charge 2.4 yuan within 3 minutes. After 3 minutes, charge 1 yuan more for every additional minute. Someone calls from a to B for t (t ≥ 3, t is an integer) minutes, and the charge is m yuan. Please write the functional relationship between M and t

Make a long-distance call from a to B, and charge 2.4 yuan within 3 minutes. After 3 minutes, charge 1 yuan more for every additional minute. Someone calls from a to B for t (t ≥ 3, t is an integer) minutes, and the charge is m yuan. Please write the functional relationship between M and t

（7.4 - 2.4）/1+3 =8

In rectangular paper ABCD, ab = 3, ad = 5. As shown in the figure, fold the paper so that point a falls at a 'on the edge of BC, and the crease is PQ. When point a' moves on the edge of BC, the end point P.Q of the crease also moves. If the limiting points P and Q move on the edge of AB and ad respectively, the maximum distance that point a 'can move on the edge of BC is ()
A. 1B. 2C. 3D. 4

As shown in Figure 1, when point d coincides with point Q, according to the folding symmetry, we can get a ′ d = ad = 5. In RT △ a ′ CD, a ′ D2 = a ′ C2 + CD2, that is 52 = (5-a ′ b) 2 + 32, we can get a ′ B = 1. As shown in Figure 2, when point P coincides with point B, according to the folding symmetry, we can get a ′ B = AB = 3, ∵ 3-1 = 2, and the maximum distance that a ′ can move on the edge of BC is 2

The mass of atom A is 5.146 * to the negative 26th power kg. If the number of protons in the nucleus of atom A is one less than that of neutrons, the relative atomic mass of atom A and the number of electrons outside its nucleus can be calculated

Relative atomic mass = atomic mass / (1.6606 × 10-27)
=5.146*10-26/（1.6606×10-27）
It's about 31
The relative atomic mass of P is also 31, so the number of extranuclear electrons is 15
Or let the number of protons be X
We get 2x + 1 = 31 and x = 15
I wish you academic progress

A and B vehicles leave from two places at the same time and meet at a distance of 15 km from the midpoint. It is known that the speed ratio of a and B vehicles is 7:6. How many km is the distance between the two places?

Because the speed ratio of a and B vehicles is 7:6, and the ratio of the distance they pass is equal to the ratio of their speed at the same time, we can set the distance that a and B vehicles pass from starting to meeting is 7x km and 6x km respectively

The waist length of isosceles triangle is 5cm, and the area of △ ABC is 12cm ^ 2. To find the base length PS: using Pythagorean theorem

Not solved yet?

It is known that a, B and C are integers, a + B = 14; C-B = 56, a-c = 28. What is the square of the sum of a, B and C?

A+B=14;C-B=56,A-C=28,
B+C=-14；
2C=42；
C=21；
B=-35；
A=49；
A+B+C=35；
A. The square of the sum of B and C = 1225;

There is a two digit number, and the sum of its ten digit number and one digit number is 14. If the number in the ten digit number is exchanged with the number in the one digit number, the two digits obtained are 36 larger than the original two digits, how about the original two digits?

Original two digit x * 10 + (14-x)
(14-x)*10+x-[x*10+(14-x)]=36
140-9x-9x-14=36
x=5
The original two digits are 59

Use a piece of paper 8 decimeters long and 6 decimeters wide to cut the largest circle. The area of the circle is______ The circumference is______ ．

3.14 × (62) 2 = 3.14 × 9 = 28.26 (square decimeter); 3.14 × 6 = 18.84 (decimeter); answer: the area of this circle is 28.26 square decimeter, the perimeter is 18.84 decimeter, so the answer is: 28.26 square decimeter, 18.84 decimeter

A is a rational number and N is a positive integer. If the nth power of a is less than 0, what are the numbers of a and N?

By a ^ n

An engineering team has built a road, which can be built 100 meters in sunny days and 60 meters in rainy days. It has been built for six days in a row and 520 meters in total. How many days are there in sunny days and rainy days?

4 sunny days and 2 rainy days