Top answers

Solve 8p = 24

In order to get p on its own, it is necessary to move it over to the right hand side of the equation. When moving something from one side to another, you flip the sign. For example, in this case, it is 8*p, ...
ST
Answered by Sebastian T. • Maths tutor
6199 Views

Solve the simultaneous equations: 5x + y = 21, x - 3y = 9

Two equations 1) 5x + y = 21, 2) x - 3y = 9. Eliminate x or y by manipulating equations 1 or 2. Equation 3 = equation 2 x 5 = 5(x-3y) = 5(9) 3) 5x - 15y = 45. Equations 3 & 1 both have 5x's so we can sub...
JL
Answered by Jason L. • Maths tutor
3717 Views

If f(x) = 3x +x^2, what is f(-2)?

f(-2) = 3(-2) + (-2) 2 = -6 + 4 = 2First you need to substitute -2 for each value of x in the function. Then you need to simplify the expression by multiplying -2 by 3 and by squaring -2. (Hint: negative num...
WB
Answered by William B. • Maths tutor
5811 Views

Find the length of AB from the right-angle triangle ABC. Angle ACB = 40 degrees and side BC = 15cm.

Label each of the sides using the angle BCA. Therefore, AC = Adjacent, BC = Hypotenuse and AB = Opposite. Use the anagram SohCahToa to identify the side that we have (BC) and the side we are looking for (AB)...
AL
Answered by Alex L. • Maths tutor
4745 Views

3x + 4y + 7z = 12. x=2 and y=-1, what is the value of z to 2 dp?

first you sub in the values you know so3(2) + 4(-1) + 7z =12then you simply the equation6-4+7z=122+7z=12then you put all the letter values on one side and all the numbers on the other12-2= 7zthen simplify10=...
EP
Answered by Emily P. • Maths tutor
3435 Views